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U+FEFF, U+FFFD; } /* devanagari */ @font-face { font-family: 'Poppins'; font-style: normal; font-weight: 200; font-display: swap; src: url(/fonts.gstatic.com/s/poppins/v20/pxiByp8kv8JHgFVrLFj_Z11lFc-K.woff2) format('woff2'); unicode-range: U+0900-097F, U+1CD0-1CF9, U+200C-200D, U+20A8, U+20B9, U+25CC, U+A830-A839, U+A8E0-A8FF; } /* latin-ext */ @font-face { font-family: 'Poppins'; font-style: normal; font-weight: 200; font-display: swap; src: url(/fonts.gstatic.com/s/poppins/v20/pxiByp8kv8JHgFVrLFj_Z1JlFc-K.woff2) format('woff2'); unicode-range: U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @font-face { font-family: 'Poppins'; font-style: normal; font-weight: 200; font-display: swap; src: url(/fonts.gstatic.com/s/poppins/v20/pxiByp8kv8JHgFVrLFj_Z1xlFQ.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, 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13" fill="none" xmlns="http://www.w3.org/2000/svg"> <path d="M6 11.5C8.76142 11.5 11 9.26142 11 6.5C11 3.73858 8.76142 1.5 6 1.5C3.23858 1.5 1 3.73858 1 6.5C1 9.26142 3.23858 11.5 6 11.5Z" stroke="white" stroke-width="1.35" stroke-linecap="round" stroke-linejoin="round"></path> <path d="M7.41436 7.91436V5.08594H4.58594" stroke="white" stroke-width="1.35" stroke-linecap="round" stroke-linejoin="round"></path> <path d="M4.58594 7.91406L7.41436 5.08564" stroke="white" stroke-width="1.35" stroke-linecap="round" stroke-linejoin="round"></path> </svg>订阅RSS提要</一个></div> </div> </div> <h1 class="post-title">问答网络研讨会”介绍MySQL查询调优为Dev (Op)年代”</h1> <div class="meta"> <p>2021年12月2日</p> <p class="post-authors"><a href="//m.doggingzone.com/blog/author/sveta-smirnova" class="co-author-display-name">Sveta Smirnova</一个></p> </div> <div class="post-content"> <p><img decoding="async" class="alignright size-medium wp-image-79190 lazy" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20168'%3E%3C/svg%3E" data-src="//m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar-300x168.png" alt="MySQL查询调优为Dev (Op)网络研讨会" width="300" height="168" data-srcset="//m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar-300x168.png 300w, //m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar-1024x572.png 1024w, //m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar-200x112.png 200w, //m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar-367x205.png 367w, //m.doggingzone.com/blog/wp-content/uploads/2021/12/MySQL-Query-Tuning-for-DevOps-webinar.png 1200w" data-sizes="(max-width: 300px) 100vw, 300px">首先,我要感谢大家参加我的11月9日,2021网络研讨会”<一个href="https://learn.percona.com/introduction-into-mysql-query-tuning-for-devops">介绍MySQL查询调优为Dev (Op)</一个>”。可在我们的记录和幻灯片<一个href="https://learn.percona.com/introduction-into-mysql-query-tuning-for-devops">在线研讨会页面</一个>。</p> <p>这里有答案的提问参与者,我无法提供网络研讨会期间由于技术问题我们有经验。</p> <p><b>问:</b>如果一个大型/复杂的从里面选择运行一个存储过程,它将使用/不使用相同的优化,因为它将运行直接查询?有什么要记住编写存储过程时,需要运行大型或复杂的选择在他们吗?</p> <p>只是想澄清,使用存储过程不使用任何相应的表上的索引?</p> <p><b>答:</b>任何查询在一个存储过程将优化一样,如果它被称为外的例行公事。我们不能运行<sp一个n id="urvanov-syntax-highlighter-64c910928ec28067264809" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n></span></span>存储过程,但是我们可以证明它的性能模式。</p> <p>例如,让我们来一个标准的测试数据库<一个href="https://github.com/datacharmer/test_db">员工</一个>并执行一个完全无效的查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec33792170020" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >选择列出first_name、last_name、标题,从员工工资- >加入标题使用(列出)加入工资使用(列出)- >工资=(选择马克斯(工资)从工资)- >或工资=(选择最小(工资)从工资);+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + |列出| first_name | last_name标题| | |薪水+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + | 43624 | Tokuyasu | Pesch |高级职员| 158220 | 43624 | | Tokuyasu | Pesch | | 158220 | | 253406 |奥利维拉|门敏|技术领导人| 38623 | + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + 3行组(4,38秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec33792170020-12"> 12</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name、<sp一个n class="crayon-h"></span>标题,<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-2"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-3"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-4"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资);</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-5"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-6"> |<sp一个n class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>first_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-7"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-8"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-9"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-10"> |<sp一个n class="crayon-h"></span>253406年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>奥利维拉<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>门敏<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>38623年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-11"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec33792170020-12"> 3<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(4,38<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>然后让我们创建一个存储程序使用这个查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec36219106969" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql > \ d | mysql >创建过程my_test() - >开始- >选择列出first_name、last_name、头衔、薪水- >从员工加入标题使用(列出)- >加入工资使用(列出)- >工资=(选择马克斯(工资)从工资)- >或工资=(选择最小(工资)从工资);- >结束- > |查询好,0行影响(0,02秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec36219106969-12"> 12</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span>\ d<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-2"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-3"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">创建</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">过程</sp一个n> <span class="crayon-h"></span>my_test ()</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-4"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">开始</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-5"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name、<sp一个n class="crayon-h"></span>标题,<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-6"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-7"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-8"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-9"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资);</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-10"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">结束</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-11"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec36219106969-12"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,02年<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>这个例程调用需要相同的时间在我的笔记本电脑如果我单独运行的查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec38441376482" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >调用my_test ();+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + |列出| first_name | last_name标题| | |薪水+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + | 43624 | Tokuyasu | Pesch |高级职员| 158220 | 43624 | | Tokuyasu | Pesch | | 158220 | | 253406 |奥利维拉|门敏|技术领导人| 38623 | + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + 3行组(4,35秒)查询好,0行影响(4,35秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec38441376482-10"> 10</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>my_test ();</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-2"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-3"> |<sp一个n class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>first_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-4"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-5"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-6"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-7"> |<sp一个n class="crayon-h"></span>253406年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>奥利维拉<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>门敏<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>38623年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-8"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-9"> 3<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(4,35<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec38441376482-10"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(4,35<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>如果我使语句仪表性能模式和再次运行查询我以下输出:</p> <div id="urvanov-syntax-highlighter-64c910928ec3b580934967" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >使用performance_schema阅读表完成信息表和列的名称可以关闭此功能得到更快的启动与——数据库改变mysql >更新setup_instruments设置启用=‘是的’,名字像“声明/ %”;查询好,0行(0 00秒)行匹配的影响:213年发生了变化:0警告:0 mysql >更新setup_consumers设置启用=‘是的’,名字像“% %声明”;查询好了,1行(0 00秒)行匹配的影响:4改变:1警告:0 mysql >使用员工;mysql数据库改变>截断performance_schema.events_statements_history;查询好,0行影响(0 01秒)mysql >选择列出first_name、last_name、头衔、薪水的员工- >加入标题使用(列出)加入工资使用(列出)- >工资=(选择马克斯(工资)从工资)- >或工资=(选择最小(工资)从工资);+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + |列出| first_name | last_name标题| | |薪水+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + | 43624 | Tokuyasu | Pesch |高级职员| 158220 | 43624 | | Tokuyasu | Pesch | | 158220 | | 253406 |奥利维拉|门敏|技术领导人| 38623 | + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + 3行组(41秒)mysql >从performance_schema选择*。events_statements_history - > thread_id =(从performance_schema选择thread_id。线程processlist_id = @@pseudo_thread_id) - >和event_name ! = '声明/ sql /截断' \ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 24392721 END_EVENT_ID: 26360924 EVENT_NAME:声明/ sql /选择来源:init_net_server_extension。cc: 93 TIMER_START: 271361154464092000 TIMER_END: 271365562450546000 TIMER_WAIT: 4407986454000 LOCK_TIME: 325000000 SQL_TEXT:选择列出first_name、last_name、头衔、薪水的员工加入标题使用(列出)加入工资使用(列出),工资=(选择马克斯(工资)从工资或工资=(选择最小(工资)从工资)消化:4 fe5ea4a8a96539aa9e837031c7c4ea59c1b772272a83c1db5e2833170c2d563 DIGEST_TEXT:选择“列出”、“first_name”、“last_name”,“标题”,“工资”的“员工”加入“头衔”使用(列出的)加入“工资”使用(列出)的薪水' =(选择马克斯(工资)从“工资”)或“工资”=(选择最小值(“工资”)“工资”)CURRENT_SCHEMA:员工OBJECT_TYPE:零OBJECT_SCHEMA:零OBJECT_NAME:零OBJECT_INSTANCE_BEGIN:零MYSQL_ERRNO: 0 RETURNED_SQLSTATE:零MESSAGE_TEXT:零错误:0警告:0 ROWS_AFFECTED: 0 ROWS_SENT: 3 ROWS_EXAMINED: 11069933 CREATED_TMP_DISK_TABLES: 0 CREATED_TMP_TABLES: 0 SELECT_FULL_JOIN: 0 SELECT_FULL_RANGE_JOIN: 0 SELECT_RANGE: 0 SELECT_RANGE_CHECK: 0 SELECT_SCAN: 3 SORT_MERGE_PASSES: 0 SORT_RANGE: 0 SORT_ROWS: 0 SORT_SCAN: 0 NO_INDEX_USED: 1 NO_GOOD_INDEX_USED: 0 NESTING_EVENT_ID:零NESTING_EVENT_TYPE:零NESTING_EVENT_LEVEL: 0 STATEMENT_ID: 428707 1行组(0 00秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-57"> 57</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-58"> 58</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-59"> 59</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-60"> 60</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-61"> 61年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-62"> 62年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-63"> 63年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-64"> 64年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-65"> 65年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-66"> 66年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-67"> 67年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-68"> 68年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-69"> 69年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-70"> 70年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-71"> 71年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-72"> 72年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-73"> 73年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-74"> 74年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-75"> 75年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-76"> 76年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-77"> 77年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-78"> 78年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-79"> 79年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-80"> 80年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-81"> 81年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-82"> 82年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3b580934967-83"> 83年</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span>performance_schema</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-2"> 阅读<sp一个n class="crayon-h"></span> <span class="crayon-st">表</sp一个n> <span class="crayon-h"></span>信息<sp一个n class="crayon-h"></span> <span class="crayon-r">为</sp一个n> <span class="crayon-h"></span>完成<sp一个n class="crayon-h"></span>的<sp一个n class="crayon-h"></span> <span class="crayon-st">表</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">列</sp一个n> <span class="crayon-h"></span> <span class="crayon-t">的名字</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-3"> 你<sp一个n class="crayon-h"></span>可以<sp一个n class="crayon-h"></span>转<sp一个n class="crayon-h"></span>从<sp一个n class="crayon-h"></span>这<sp一个n class="crayon-h"></span>功能<sp一个n class="crayon-h"></span> <span class="crayon-st">来</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">得到</sp一个n> <span class="crayon-h"></span>一个<sp一个n class="crayon-h"></span>快<sp一个n class="crayon-h"></span>启动<sp一个n class="crayon-h"></span> <span class="crayon-st">与</sp一个n> <span class="crayon-h"></span>——一个</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-4"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-5"> <span class="crayon-st">数据库</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">改变了</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-6"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-7"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">更新</sp一个n> <span class="crayon-h"></span>setup_instruments<sp一个n class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>启用了=<sp一个n class="crayon-s">“是的”</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>的名字<sp一个n class="crayon-h"></span> <span class="crayon-st">就像</sp一个n> <span class="crayon-h"></span> <span class="crayon-s">的声明/ %</sp一个n>;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-8"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-9"> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>匹配:<sp一个n class="crayon-h"></span>213年<sp一个n class="crayon-h"></span> <span class="crayon-st">改变了</sp一个n>:<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-10"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-11"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">更新</sp一个n> <span class="crayon-h"></span>setup_consumers<sp一个n class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>启用了=<sp一个n class="crayon-s">“是的”</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>的名字<sp一个n class="crayon-h"></span> <span class="crayon-st">就像</sp一个n> <span class="crayon-h"></span> <span class="crayon-s">“% %声明”</sp一个n>;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-12"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-13"> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>匹配:<sp一个n class="crayon-h"></span>4<sp一个n class="crayon-h"></span> <span class="crayon-st">改变了</sp一个n>:<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-14"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-15"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span>雇员;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-16"> <span class="crayon-st">数据库</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">改变了</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-17"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-18"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">截断</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history;</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-19"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,1<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-20"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-21"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name、<sp一个n class="crayon-h"></span>标题,<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-22"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-23"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-24"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资);</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-25"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-26"> |<sp一个n class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>first_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-27"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-28"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-29"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-30"> |<sp一个n class="crayon-h"></span>253406年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>奥利维拉<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>门敏<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>38623年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-31"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-32"> 3<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(4,41岁<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-33"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-34"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>*<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-35"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>thread_id = (<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>thread_id<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.threads<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span> <a href="//m.doggingzone.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8cfcfee3efe9ffffe0e5fff8d3e5e8b1cc">(电子邮件保护)</一个>@pseudo_thread_id)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-36"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>event_name<sp一个n class="crayon-h"></span>! =<sp一个n class="crayon-h"></span> <span class="crayon-s">声明/ sql /截断的</sp一个n>\ G</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-37"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-38"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-39"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>24392721</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-40"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>26360924</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-41"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n> <span class="crayon-r">sql</sp一个n> <span class="crayon-o">/</sp一个n> <span class="crayon-st">选择</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-42"> <span class="crayon-h"></span>来源:<sp一个n class="crayon-h"></span>init_net_server_extension.cc: 93</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-43"> <span class="crayon-h"></span>TIMER_START:<sp一个n class="crayon-h"></span>271361154464092000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-44"> <span class="crayon-h"></span>TIMER_END:<sp一个n class="crayon-h"></span>271365562450546000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-45"> <span class="crayon-h"></span>TIMER_WAIT:<sp一个n class="crayon-h"></span>4407986454000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-46"> <span class="crayon-h"></span>LOCK_TIME:<sp一个n class="crayon-h"></span>325000000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-47"> <span class="crayon-h"></span>SQL_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name、<sp一个n class="crayon-h"></span>标题,<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-48"> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)<sp一个n class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-49"> <span class="crayon-h"></span>摘要:<sp一个n class="crayon-h"></span>4 fe5ea4a8a96539aa9e837031c7c4ea59c1b772272a83c1db5e2833170c2d563</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-50"> <span class="crayon-h"></span>DIGEST_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出的<sp一个n class="crayon-h"></span>,<sp一个n class="crayon-h"></span>“first_name”<sp一个n class="crayon-h"></span>,<sp一个n class="crayon-h"></span>“last_name”<sp一个n class="crayon-h"></span>,<sp一个n class="crayon-h"></span>“标题”<sp一个n class="crayon-h"></span>,<sp一个n class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工”<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>“标题”<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span>列出的<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-51"> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span>列出的<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-52"> <span class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“工资”<sp一个n class="crayon-h"></span>)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-53"> <span class="crayon-h"></span>CURRENT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-54"> <span class="crayon-h"></span>OBJECT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-55"> <span class="crayon-h"></span>OBJECT_SCHEMA:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-56"> <span class="crayon-h"></span>OBJECT_NAME:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-57"> <span class="crayon-h"></span>OBJECT_INSTANCE_BEGIN:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-58"> <span class="crayon-h"></span>MYSQL_ERRNO:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-59"> <span class="crayon-h"></span>RETURNED_SQLSTATE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-60"> <span class="crayon-h"></span>MESSAGE_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-61"> <span class="crayon-h"></span> <span class="crayon-st">错误</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-62"> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-63"> <span class="crayon-h"></span>ROWS_AFFECTED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-64"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-65"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>11069933</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-66"> CREATED_TMP_DISK_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-67"> <span class="crayon-h"></span>CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-68"> <span class="crayon-h"></span>SELECT_FULL_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-69"> <span class="crayon-h"></span>SELECT_FULL_RANGE_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-70"> <span class="crayon-h"></span>SELECT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-71"> <span class="crayon-h"></span>SELECT_RANGE_CHECK:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-72"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-73"> <span class="crayon-h"></span>SORT_MERGE_PASSES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-74"> <span class="crayon-h"></span>SORT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-75"> <span class="crayon-h"></span>SORT_ROWS:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-76"> <span class="crayon-h"></span>SORT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-77"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-78"> <span class="crayon-h"></span>NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-79"> <span class="crayon-h"></span>NESTING_EVENT_ID:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-80"> <span class="crayon-h"></span>NESTING_EVENT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-81"> <span class="crayon-h"></span>NESTING_EVENT_LEVEL:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-82"> <span class="crayon-h"></span>STATEMENT_ID:<sp一个n class="crayon-h"></span>428707年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3b580934967-83"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>有趣的部分输出性能与非零值的字段。也就是说,</p> <div id="urvanov-syntax-highlighter-64c910928ec3c126303029" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">ROWS_SENT: 3 ROWS_EXAMINED: 11069933 SELECT_SCAN: 3 NO_INDEX_USED: 1</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3c126303029-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3c126303029-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec3c126303029-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec3c126303029-4"> 4</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3c126303029-1"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3c126303029-2"> ROWS_EXAMINED:<sp一个n class="crayon-h"></span>11069933</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec3c126303029-3"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec3c126303029-4"> NO_INDEX_USED:<sp一个n class="crayon-h"></span>1</div> </div></td> </tr> </tbody> </table> </div> </div> <p>现在让我们来调用存储过程和比较这些值。</p> <div id="urvanov-syntax-highlighter-64c910928ec40172828272" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >截断performance_schema.events_statements_history;查询好,0行影响(0 00秒)mysql >调用my_test ();+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + |列出| first_name | last_name标题| | |薪水+ - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + | 43624 | Tokuyasu | Pesch |高级职员| 158220 | 43624 | | Tokuyasu | Pesch | | 158220 | | 253406 |奥利维拉|门敏|技术领导人| 38623 | + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + 3行组(4,55秒)查询好,0行影响(4,55秒)mysql >从performance_schema选择*。events_statements_history - > thread_id =(从performance_schema选择thread_id。线程processlist_id = @@pseudo_thread_id) - >和event_name ! = '声明/ sql /截断' \ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 28336202 END_EVENT_ID: 30292242 EVENT_NAME:声明/ sp /支撑来源:sp_head。cc: 2210 TIMER_START: 271549571279270000 TIMER_END: 271554128099300000 TIMER_WAIT: 4556820030000 LOCK_TIME: 139000000 SQL_TEXT:选择列出first_name、last_name、头衔、薪水的员工加入标题使用(列出)加入工资使用(列出),工资=(选择马克斯(工资)从工资或工资=(选择最小(工资)从工资)消化:零DIGEST_TEXT:零CURRENT_SCHEMA:员工OBJECT_TYPE:过程OBJECT_SCHEMA:员工OBJECT_NAME: my_test OBJECT_INSTANCE_BEGIN:零MYSQL_ERRNO: 0 RETURNED_SQLSTATE:零MESSAGE_TEXT:零错误:0警告:0 ROWS_AFFECTED: 0 ROWS_SENT: 3 ROWS_EXAMINED: 11069933 CREATED_TMP_DISK_TABLES: 0 CREATED_TMP_TABLES: 0 SELECT_FULL_JOIN: 0 SELECT_FULL_RANGE_JOIN: 0 SELECT_RANGE: 0 SELECT_RANGE_CHECK: 0 SELECT_SCAN: 3 SORT_MERGE_PASSES: 0 SORT_RANGE: 0 SORT_ROWS: 0 SORT_SCAN: 0 NO_INDEX_USED: 1 NO_GOOD_INDEX_USED: 0 NESTING_EVENT_ID: 28336201 NESTING_EVENT_TYPE:声明NESTING_EVENT_LEVEL: 1 STATEMENT_ID: 429597 * * * * * * * * * * * * * * * * * * * * * * * * * * * 2。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 28336201 END_EVENT_ID: 30292243 EVENT_NAME:声明/ sql / call_procedure来源:init_net_server_extension。答:93 TIMER_START: 271549571185646000 TIMER_END: 271554128135521000 TIMER_WAIT: 4556949875000 LOCK_TIME: 0 SQL_TEXT:叫my_test()消化:070 cb7d4d2eba9690a3a993ec61700fb6d6c3e46166e329408d7284e45fd58c2 DIGEST_TEXT:叫“my_test”() CURRENT_SCHEMA:员工OBJECT_TYPE:零OBJECT_SCHEMA:零OBJECT_NAME:零OBJECT_INSTANCE_BEGIN:零MYSQL_ERRNO: 0 RETURNED_SQLSTATE: 00000 MESSAGE_TEXT:零错误:0警告:0 ROWS_AFFECTED: 0 ROWS_SENT: 0 ROWS_EXAMINED: 0 CREATED_TMP_DISK_TABLES: 0 CREATED_TMP_TABLES: 0 SELECT_FULL_JOIN: 0 SELECT_FULL_RANGE_JOIN: 0 SELECT_RANGE: 0 SELECT_RANGE_CHECK: 0 SELECT_SCAN: 0 SORT_MERGE_PASSES: 0 SORT_RANGE: 0 SORT_ROWS: 0 SORT_SCAN: 0 NO_INDEX_USED: 0 NO_GOOD_INDEX_USED: 0 NESTING_EVENT_ID:零NESTING_EVENT_TYPE:零NESTING_EVENT_LEVEL: 0 STATEMENT_ID: 429596 2行设置(0 00秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-57"> 57</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-58"> 58</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-59"> 59</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-60"> 60</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-61"> 61年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-62"> 62年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-63"> 63年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-64"> 64年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-65"> 65年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-66"> 66年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-67"> 67年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-68"> 68年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-69"> 69年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-70"> 70年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-71"> 71年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-72"> 72年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-73"> 73年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-74"> 74年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-75"> 75年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-76"> 76年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-77"> 77年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-78"> 78年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-79"> 79年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-80"> 80年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-81"> 81年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-82"> 82年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-83"> 83年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-84"> 84年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-85"> 85年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-86"> 86年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-87"> 87年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-88"> 88年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-89"> 89年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-90"> 90年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-91"> 91年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-92"> 92年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-93"> 93年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-94"> 94年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-95"> 95年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-96"> 96年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-97"> 97年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-98"> 98年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-99"> 99年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-100"> One hundred.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-101"> 101年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-102"> 102年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-103"> 103年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-104"> 104年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec40172828272-105"> 105年</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">截断</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-2"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-3"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-4"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>my_test ();</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-5"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-6"> |<sp一个n class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>first_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-7"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-8"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-9"> |<sp一个n class="crayon-h"></span>43624年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Tokuyasu<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>Pesch<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>158220年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-10"> |<sp一个n class="crayon-h"></span>253406年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>奥利维拉<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>门敏<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>38623年<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-11"> + - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-12"> 3<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(4,55岁<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-13"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(4,55岁<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-14"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-15"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>*<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-16"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>thread_id = (<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>thread_id<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.threads<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span> <a href="//m.doggingzone.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5e2e2c313d3b2d2d32372d2a01373a631e">(电子邮件保护)</一个>@pseudo_thread_id)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-17"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>event_name<sp一个n class="crayon-h"></span>! =<sp一个n class="crayon-h"></span> <span class="crayon-s">声明/ sql /截断的</sp一个n>\ G</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-18"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-19"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-20"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>28336202</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-21"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>30292242</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-22"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n>sp<sp一个n class="crayon-o">/</sp一个n>支撑</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-23"> <span class="crayon-h"></span>来源:<sp一个n class="crayon-h"></span>sp_head.cc: 2210</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-24"> <span class="crayon-h"></span>TIMER_START:<sp一个n class="crayon-h"></span>271549571279270000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-25"> <span class="crayon-h"></span>TIMER_END:<sp一个n class="crayon-h"></span>271554128099300000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-26"> <span class="crayon-h"></span>TIMER_WAIT:<sp一个n class="crayon-h"></span>4556820030000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-27"> <span class="crayon-h"></span>LOCK_TIME:<sp一个n class="crayon-h"></span>139000000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-28"> <span class="crayon-h"></span>SQL_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name、<sp一个n class="crayon-h"></span>标题,<sp一个n class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-29"> <span class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)<sp一个n class="crayon-h"></span> <span class="crayon-r">或</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">最小值</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-30"> <span class="crayon-h"></span>摘要:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-31"> <span class="crayon-h"></span>DIGEST_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-32"> <span class="crayon-h"></span>CURRENT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-33"> <span class="crayon-h"></span>OBJECT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">过程</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-34"> <span class="crayon-h"></span>OBJECT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-35"> <span class="crayon-h"></span>OBJECT_NAME:<sp一个n class="crayon-h"></span>my_test</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-36"> <span class="crayon-h"></span>OBJECT_INSTANCE_BEGIN:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-37"> <span class="crayon-h"></span>MYSQL_ERRNO:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-38"> <span class="crayon-h"></span>RETURNED_SQLSTATE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-39"> <span class="crayon-h"></span>MESSAGE_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-40"> <span class="crayon-h"></span> <span class="crayon-st">错误</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-41"> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-42"> <span class="crayon-h"></span>ROWS_AFFECTED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-43"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-44"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>11069933</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-45"> CREATED_TMP_DISK_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-46"> <span class="crayon-h"></span>CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-47"> <span class="crayon-h"></span>SELECT_FULL_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-48"> <span class="crayon-h"></span>SELECT_FULL_RANGE_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-49"> <span class="crayon-h"></span>SELECT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-50"> <span class="crayon-h"></span>SELECT_RANGE_CHECK:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-51"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-52"> <span class="crayon-h"></span>SORT_MERGE_PASSES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-53"> <span class="crayon-h"></span>SORT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-54"> <span class="crayon-h"></span>SORT_ROWS:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-55"> <span class="crayon-h"></span>SORT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-56"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-57"> <span class="crayon-h"></span>NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-58"> <span class="crayon-h"></span>NESTING_EVENT_ID:<sp一个n class="crayon-h"></span>28336201</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-59"> <span class="crayon-h"></span>NESTING_EVENT_TYPE:<sp一个n class="crayon-h"></span>声明</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-60"> <span class="crayon-h"></span>NESTING_EVENT_LEVEL:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-61"> <span class="crayon-h"></span>STATEMENT_ID:<sp一个n class="crayon-h"></span>429597年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-62"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>2。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-63"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-64"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>28336201</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-65"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>30292243</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-66"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n> <span class="crayon-r">sql</sp一个n> <span class="crayon-o">/</sp一个n>call_procedure</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-67"> <span class="crayon-h"></span>来源:<sp一个n class="crayon-h"></span>init_net_server_extension.cc: 93</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-68"> <span class="crayon-h"></span>TIMER_START:<sp一个n class="crayon-h"></span>271549571185646000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-69"> <span class="crayon-h"></span>TIMER_END:<sp一个n class="crayon-h"></span>271554128135521000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-70"> <span class="crayon-h"></span>TIMER_WAIT:<sp一个n class="crayon-h"></span>4556949875000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-71"> <span class="crayon-h"></span>LOCK_TIME:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-72"> <span class="crayon-h"></span>SQL_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>my_test ()</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-73"> <span class="crayon-h"></span>摘要:<sp一个n class="crayon-h"></span>070年cb7d4d2eba9690a3a993ec61700fb6d6c3e46166e329408d7284e45fd58c2</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-74"> <span class="crayon-h"></span>DIGEST_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>“my_test”<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-h"></span>)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-75"> <span class="crayon-h"></span>CURRENT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-76"> <span class="crayon-h"></span>OBJECT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-77"> <span class="crayon-h"></span>OBJECT_SCHEMA:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-78"> <span class="crayon-h"></span>OBJECT_NAME:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-79"> <span class="crayon-h"></span>OBJECT_INSTANCE_BEGIN:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-80"> <span class="crayon-h"></span>MYSQL_ERRNO:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-81"> <span class="crayon-h"></span>RETURNED_SQLSTATE:<sp一个n class="crayon-h"></span>00000年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-82"> <span class="crayon-h"></span>MESSAGE_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-83"> <span class="crayon-h"></span> <span class="crayon-st">错误</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-84"> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-85"> <span class="crayon-h"></span>ROWS_AFFECTED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-86"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-87"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-88"> CREATED_TMP_DISK_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-89"> <span class="crayon-h"></span>CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-90"> <span class="crayon-h"></span>SELECT_FULL_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-91"> <span class="crayon-h"></span>SELECT_FULL_RANGE_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-92"> <span class="crayon-h"></span>SELECT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-93"> <span class="crayon-h"></span>SELECT_RANGE_CHECK:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-94"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-95"> <span class="crayon-h"></span>SORT_MERGE_PASSES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-96"> <span class="crayon-h"></span>SORT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-97"> <span class="crayon-h"></span>SORT_ROWS:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-98"> <span class="crayon-h"></span>SORT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-99"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-100"> <span class="crayon-h"></span>NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-101"> <span class="crayon-h"></span>NESTING_EVENT_ID:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-102"> <span class="crayon-h"></span>NESTING_EVENT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-103"> <span class="crayon-h"></span>NESTING_EVENT_LEVEL:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-104"> <span class="crayon-h"></span>STATEMENT_ID:<sp一个n class="crayon-h"></span>429596年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec40172828272-105"> 2<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>这一次,从performance_schema选择。events_statements_history返回两行:一个用于<sp一个n id="urvanov-syntax-highlighter-64c910928ec41322350362" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">选择</sp一个n></span></span>声明和一个<sp一个n id="urvanov-syntax-highlighter-64c910928ec43426193815" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-v">调用</sp一个n></span></span>命令。我们感兴趣的数据<sp一个n id="urvanov-syntax-highlighter-64c910928ec45635979709" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-v">选择</sp一个n></span></span>声明。它是:</p> <div id="urvanov-syntax-highlighter-64c910928ec46164377887" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">ROWS_SENT: 3 ROWS_EXAMINED: 11069933 SELECT_SCAN: 3 NO_INDEX_USED: 1</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec46164377887-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec46164377887-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec46164377887-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec46164377887-4"> 4</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec46164377887-1"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec46164377887-2"> ROWS_EXAMINED:<sp一个n class="crayon-h"></span>11069933</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec46164377887-3"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec46164377887-4"> NO_INDEX_USED:<sp一个n class="crayon-h"></span>1</div> </div></td> </tr> </tbody> </table> </div> </div> <p>所以性能指标是完全一样的原始查询。</p> <p>好吧,这是缓慢的,不是有效的查询。但是使用索引呢?</p> <p>让我们工艺的另一个例子。考虑一个查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec48413654324" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">SELECT COUNT(*),通过标题标题标题组;</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec48413654324-1"> 1</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec48413654324-1"> <span class="crayon-st">选择数</sp一个n>(*),<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>标题;</div> </div></td> </tr> </tbody> </table> </div> </div> <p>和存储过程:</p> <div id="urvanov-syntax-highlighter-64c910928ec49031964332" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >创建过程my_second_test() - >开始- > SELECT COUNT(*),通过标题标题标题组;- >结束- > |查询好,0行影响(0,02秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec49031964332-6"> 6</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">创建</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">过程</sp一个n> <span class="crayon-h"></span>my_second_test ()</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-2"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">开始</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-3"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择数</sp一个n>(*),<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>标题;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-4"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">结束</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-5"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec49031964332-6"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,02年<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>现在让我们调用查询并检查数据的性能模式:</p> <div id="urvanov-syntax-highlighter-64c910928ec4b019227564" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >截断performance_schema.events_statements_history;查询好,0行影响(0 00秒)mysql > SELECT COUNT(*),通过标题标题标题组;+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | COUNT(*) | |标题+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | 97750 |高级工程师| | 107391 | |员工工程师| 115003 | | 92853 | |高级职员| | 15128 | |助理工程师| 15159 |技术领导人| | 24 |经理| + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + 7行组(0,28 sec)从performance_schema mysql > SELECT *。events_statements_history - > thread_id =(从performance_schema选择thread_id。线程processlist_id = @@pseudo_thread_id) - >和event_name ! = '声明/ sql /截断' \ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 30340666 END_EVENT_ID: 30346280 EVENT_NAME:声明/ sql /选择来源:init_net_server_extension。cc: 93 TIMER_START: 271987423077801000 TIMER_END: 271987697673114000 TIMER_WAIT: 274595313000 LOCK_TIME: 137000000 SQL_TEXT: SELECT COUNT(*),从标题组标题标题消化:3 b63daf99fa8586784dcbc73f82b79e777e4fc074c37de3ebd25753f0d684a46 DIGEST_TEXT: SELECT COUNT(*),从“标题”组“标题”,“标题”CURRENT_SCHEMA:员工OBJECT_TYPE:零OBJECT_SCHEMA:零OBJECT_NAME:零OBJECT_INSTANCE_BEGIN:零MYSQL_ERRNO: 0 RETURNED_SQLSTATE:零MESSAGE_TEXT:零错误:0警告:0 ROWS_AFFECTED: 0 ROWS_SENT: 7 ROWS_EXAMINED: 443308 CREATED_TMP_DISK_TABLES: 0 CREATED_TMP_TABLES: 1 SELECT_FULL_JOIN: 0 SELECT_FULL_RANGE_JOIN: 0 SELECT_RANGE: 0 SELECT_RANGE_CHECK: 0 SELECT_SCAN: 1 SORT_MERGE_PASSES: 0 SORT_RANGE: 0 SORT_ROWS: 0 SORT_SCAN: 0 NO_INDEX_USED: 0 NO_GOOD_INDEX_USED: 0 NESTING_EVENT_ID:零NESTING_EVENT_TYPE:零NESTING_EVENT_LEVEL: 0 STATEMENT_ID: 431634 1行组(0 00秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-57"> 57</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-58"> 58</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-59"> 59</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-60"> 60</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-61"> 61年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-62"> 62年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-63"> 63年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4b019227564-64"> 64年</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">截断</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-2"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-3"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-4"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择数</sp一个n>(*),<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>标题;</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-5"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-6"> |<sp一个n class="crayon-h"></span> <span class="crayon-e ">数</sp一个n>(*)<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-7"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-8"> |<sp一个n class="crayon-h"></span>97750年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-9"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>107391年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-10"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>115003年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-11"> |<sp一个n class="crayon-h"></span>92853年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-12"> |<sp一个n class="crayon-h"></span>15128年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>助理<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-13"> |<sp一个n class="crayon-h"></span>15159年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-14"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>24<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>经理<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-15"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-16"> 7<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,28<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-17"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-18"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>*<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-19"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>thread_id = (<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>thread_id<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.threads<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span> <a href="//m.doggingzone.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4232302d212731312e2b31361d2b267f02">(电子邮件保护)</一个>@pseudo_thread_id)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-20"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>event_name<sp一个n class="crayon-h"></span>! =<sp一个n class="crayon-h"></span> <span class="crayon-s">声明/ sql /截断的</sp一个n>\ G</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-21"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-22"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-23"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>30340666</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-24"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>30346280</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-25"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n> <span class="crayon-r">sql</sp一个n> <span class="crayon-o">/</sp一个n> <span class="crayon-st">选择</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-26"> <span class="crayon-h"></span>来源:<sp一个n class="crayon-h"></span>init_net_server_extension.cc: 93</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-27"> <span class="crayon-h"></span>TIMER_START:<sp一个n class="crayon-h"></span>271987423077801000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-28"> <span class="crayon-h"></span>TIMER_END:<sp一个n class="crayon-h"></span>271987697673114000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-29"> <span class="crayon-h"></span>TIMER_WAIT:<sp一个n class="crayon-h"></span>274595313000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-30"> <span class="crayon-h"></span>LOCK_TIME:<sp一个n class="crayon-h"></span>137000000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-31"> <span class="crayon-h"></span>SQL_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择数</sp一个n>(*),<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>标题</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-32"> <span class="crayon-h"></span>摘要:<sp一个n class="crayon-h"></span>3 b63daf99fa8586784dcbc73f82b79e777e4fc074c37de3ebd25753f0d684a46</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-33"> <span class="crayon-h"></span>DIGEST_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择数</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span>*<sp一个n class="crayon-h"></span>)<sp一个n class="crayon-h"></span>,<sp一个n class="crayon-h"></span>“标题”<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“标题”<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>“标题”</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-34"> <span class="crayon-h"></span>CURRENT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-35"> <span class="crayon-h"></span>OBJECT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-36"> <span class="crayon-h"></span>OBJECT_SCHEMA:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-37"> <span class="crayon-h"></span>OBJECT_NAME:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-38"> <span class="crayon-h"></span>OBJECT_INSTANCE_BEGIN:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-39"> <span class="crayon-h"></span>MYSQL_ERRNO:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-40"> <span class="crayon-h"></span>RETURNED_SQLSTATE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-41"> <span class="crayon-h"></span>MESSAGE_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-42"> <span class="crayon-h"></span> <span class="crayon-st">错误</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-43"> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-44"> <span class="crayon-h"></span>ROWS_AFFECTED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-45"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>7</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-46"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>443308年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-47"> CREATED_TMP_DISK_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-48"> <span class="crayon-h"></span>CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-49"> <span class="crayon-h"></span>SELECT_FULL_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-50"> <span class="crayon-h"></span>SELECT_FULL_RANGE_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-51"> <span class="crayon-h"></span>SELECT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-52"> <span class="crayon-h"></span>SELECT_RANGE_CHECK:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-53"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-54"> <span class="crayon-h"></span>SORT_MERGE_PASSES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-55"> <span class="crayon-h"></span>SORT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-56"> <span class="crayon-h"></span>SORT_ROWS:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-57"> <span class="crayon-h"></span>SORT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-58"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-59"> <span class="crayon-h"></span>NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-60"> <span class="crayon-h"></span>NESTING_EVENT_ID:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-61"> <span class="crayon-h"></span>NESTING_EVENT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-62"> <span class="crayon-h"></span>NESTING_EVENT_LEVEL:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-63"> <span class="crayon-h"></span>STATEMENT_ID:<sp一个n class="crayon-h"></span>431634年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4b019227564-64"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>在这种情况下,图片是不同的:</p> <div id="urvanov-syntax-highlighter-64c910928ec4c198294405" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">ROWS_SENT: 7 ROWS_EXAMINED: 443308 CREATED_TMP_TABLES: 1 SELECT_SCAN: 1 NO_INDEX_USED: 0 NO_GOOD_INDEX_USED: 0</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4c198294405-6"> 6</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-1"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>7</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-2"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>443308年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-3"> CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-4"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-5"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4c198294405-6"> NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> </div></td> </tr> </tbody> </table> </div> </div> <p>这仍然不是一个非常有效的查询:它使用索引扫描但它确实使用索引。</p> <p>让我们检查数据存储过程:</p> <div id="urvanov-syntax-highlighter-64c910928ec4e595022973" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >截断performance_schema.events_statements_history;查询好,0行影响(0 00秒)mysql >调用my_second_test ();+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | COUNT(*) | |标题+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | 97750 |高级工程师| | 107391 | |员工工程师| 115003 | | 92853 | |高级职员| | 15128 | |助理工程师| 15159 |技术领导人| | 24 |经理| + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + 7行组(0,28秒)查询好,0行影响(0,28 sec)从performance_schema mysql > SELECT *。events_statements_history - > thread_id =(从performance_schema选择thread_id。线程processlist_id = @@pseudo_thread_id) - >和event_name ! = '声明/ sql /截断' \ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 30354940 END_EVENT_ID: 30360553 EVENT_NAME:声明/ sp /支撑来源:sp_head。答:2210 TIMER_START: 272124909174908000 TIMER_END: 272125181823179000 TIMER_WAIT: 272648271000 LOCK_TIME: 222000000 SQL_TEXT: SELECT COUNT(*),由标题标题标题组消化:零DIGEST_TEXT:零CURRENT_SCHEMA:员工OBJECT_TYPE:过程OBJECT_SCHEMA:员工OBJECT_NAME: my_second_test OBJECT_INSTANCE_BEGIN:零MYSQL_ERRNO: 0 RETURNED_SQLSTATE:零MESSAGE_TEXT:零错误:0警告:0 ROWS_AFFECTED: 0 ROWS_SENT: 7 ROWS_EXAMINED: 443308 CREATED_TMP_DISK_TABLES: 0 CREATED_TMP_TABLES: 1 SELECT_FULL_JOIN: 0 SELECT_FULL_RANGE_JOIN: 0 SELECT_RANGE: 0 SELECT_RANGE_CHECK: 0 SELECT_SCAN: 1 SORT_MERGE_PASSES: 0 SORT_RANGE: 0 SORT_ROWS: 0 SORT_SCAN: 0 NO_INDEX_USED: 0 NO_GOOD_INDEX_USED: 0 NESTING_EVENT_ID: 30354939 NESTING_EVENT_TYPE:声明NESTING_EVENT_LEVEL: 1 STATEMENT_ID: 432318 * * * * * * * * * * * * * * * * * * * * * * * * * * * 2。行* * * * * * * * * * * * * * * * * * * * * * * * * * * THREAD_ID: 100414 EVENT_ID: 30354939 END_EVENT_ID: 30360554 EVENT_NAME:声明/ sql / call_procedure <我省略了数据调用语句的></textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-57"> 57</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-58"> 58</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-59"> 59</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-60"> 60</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-61"> 61年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-62"> 62年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-63"> 63年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-64"> 64年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-65"> 65年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-66"> 66年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-67"> 67年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-68"> 68年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-69"> 69年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec4e595022973-70"> 70年</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">截断</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-2"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-3"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-4"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>my_second_test ();</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-5"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-6"> |<sp一个n class="crayon-h"></span> <span class="crayon-e ">数</sp一个n>(*)<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-7"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-8"> |<sp一个n class="crayon-h"></span>97750年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-9"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>107391年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-10"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>115003年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-11"> |<sp一个n class="crayon-h"></span>92853年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>高级<sp一个n class="crayon-h"></span>工作人员<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-12"> |<sp一个n class="crayon-h"></span>15128年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>助理<sp一个n class="crayon-h"></span>工程师<sp一个n class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-13"> |<sp一个n class="crayon-h"></span>15159年<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>技术<sp一个n class="crayon-h"></span>领袖<sp一个n class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-14"> |<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>24<sp一个n class="crayon-h"></span>|<sp一个n class="crayon-h"></span>经理<sp一个n class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span> <span class="crayon-h"></span>|</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-15"> + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-16"> 7<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,28<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-17"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,28<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-18"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-19"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>*<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.events_statements_history<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-20"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>thread_id = (<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>thread_id<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>performance_schema.threads<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span> <a href="//m.doggingzone.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3d4d4f525e584e4e51544e49625459007d">(电子邮件保护)</一个>@pseudo_thread_id)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-21"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>event_name<sp一个n class="crayon-h"></span>! =<sp一个n class="crayon-h"></span> <span class="crayon-s">声明/ sql /截断的</sp一个n>\ G</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-22"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-23"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-24"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>30354940</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-25"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>30360553</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-26"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n>sp<sp一个n class="crayon-o">/</sp一个n>支撑</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-27"> <span class="crayon-h"></span>来源:<sp一个n class="crayon-h"></span>sp_head.cc: 2210</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-28"> <span class="crayon-h"></span>TIMER_START:<sp一个n class="crayon-h"></span>272124909174908000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-29"> <span class="crayon-h"></span>TIMER_END:<sp一个n class="crayon-h"></span>272125181823179000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-30"> <span class="crayon-h"></span>TIMER_WAIT:<sp一个n class="crayon-h"></span>272648271000</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-31"> <span class="crayon-h"></span>LOCK_TIME:<sp一个n class="crayon-h"></span>222000000</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-32"> <span class="crayon-h"></span>SQL_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">选择数</sp一个n>(*),<sp一个n class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题<sp一个n class="crayon-h"></span> <span class="crayon-r">集团</sp一个n> <span class="crayon-h"></span> <span class="crayon-r">通过</sp一个n> <span class="crayon-h"></span>标题</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-33"> <span class="crayon-h"></span>摘要:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-34"> <span class="crayon-h"></span>DIGEST_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-35"> <span class="crayon-h"></span>CURRENT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-36"> <span class="crayon-h"></span>OBJECT_TYPE:<sp一个n class="crayon-h"></span> <span class="crayon-st">过程</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-37"> <span class="crayon-h"></span>OBJECT_SCHEMA:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-38"> <span class="crayon-h"></span>OBJECT_NAME:<sp一个n class="crayon-h"></span>my_second_test</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-39"> <span class="crayon-h"></span>OBJECT_INSTANCE_BEGIN:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-40"> <span class="crayon-h"></span>MYSQL_ERRNO:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-41"> <span class="crayon-h"></span>RETURNED_SQLSTATE:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-42"> <span class="crayon-h"></span>MESSAGE_TEXT:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-43"> <span class="crayon-h"></span> <span class="crayon-st">错误</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-44"> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-45"> <span class="crayon-h"></span>ROWS_AFFECTED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-46"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>7</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-47"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>443308年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-48"> CREATED_TMP_DISK_TABLES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-49"> <span class="crayon-h"></span>CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-50"> <span class="crayon-h"></span>SELECT_FULL_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-51"> <span class="crayon-h"></span>SELECT_FULL_RANGE_JOIN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-52"> <span class="crayon-h"></span>SELECT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-53"> <span class="crayon-h"></span>SELECT_RANGE_CHECK:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-54"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-55"> <span class="crayon-h"></span>SORT_MERGE_PASSES:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-56"> <span class="crayon-h"></span>SORT_RANGE:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-57"> <span class="crayon-h"></span>SORT_ROWS:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-58"> <span class="crayon-h"></span>SORT_SCAN:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-59"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-60"> <span class="crayon-h"></span>NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-61"> <span class="crayon-h"></span>NESTING_EVENT_ID:<sp一个n class="crayon-h"></span>30354939</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-62"> <span class="crayon-h"></span>NESTING_EVENT_TYPE:<sp一个n class="crayon-h"></span>声明</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-63"> <span class="crayon-h"></span>NESTING_EVENT_LEVEL:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-64"> <span class="crayon-h"></span>STATEMENT_ID:<sp一个n class="crayon-h"></span>432318年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-65"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>2。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-66"> <span class="crayon-h"></span>THREAD_ID:<sp一个n class="crayon-h"></span>100414年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-67"> <span class="crayon-h"></span>EVENT_ID:<sp一个n class="crayon-h"></span>30354939</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-68"> <span class="crayon-h"></span>END_EVENT_ID:<sp一个n class="crayon-h"></span>30360554</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-69"> <span class="crayon-h"></span>EVENT_NAME:<sp一个n class="crayon-h"></span>声明<sp一个n class="crayon-o">/</sp一个n> <span class="crayon-r">sql</sp一个n> <span class="crayon-o">/</sp一个n>call_procedure</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec4e595022973-70"> <span class="crayon-h"><</sp一个n>我<sp一个n class="crayon-h"></span>省略了<sp一个n class="crayon-h"></span>数据<sp一个n class="crayon-h"></span> <span class="crayon-r">为</sp一个n> <span class="crayon-h"></span>的<sp一个n class="crayon-h"></span> <span class="crayon-st">调用</sp一个n> <span class="crayon-h"></span>声明<sp一个n class="crayon-h">></sp一个n> </div> </div></td> </tr> </tbody> </table> </div> </div> <p>计数器又有完全相同的值作为独立的语句:</p> <div id="urvanov-syntax-highlighter-64c910928ec50904845865" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">ROWS_SENT: 7 ROWS_EXAMINED: 443308 CREATED_TMP_TABLES: 1 SELECT_SCAN: 1 NO_INDEX_USED: 0 NO_GOOD_INDEX_USED: 0</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec50904845865-6"> 6</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-1"> <span class="crayon-h"></span>ROWS_SENT:<sp一个n class="crayon-h"></span>7</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-2"> <span class="crayon-h"></span>ROWS_EXAMINED:<sp一个n class="crayon-h"></span>443308年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-3"> CREATED_TMP_TABLES:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-4"> <span class="crayon-h"></span>SELECT_SCAN:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-5"> <span class="crayon-h"></span>NO_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec50904845865-6"> NO_GOOD_INDEX_USED:<sp一个n class="crayon-h"></span>0</div> </div></td> </tr> </tbody> </table> </div> </div> <p>我们有证据证明优化器创建相同的查询计划无论查询被称为内部存储过程。</p> <p><b>问:</b>几次的时候建立一个与多个索引,查询一个表解释命令向我展示了一个索引,显然不是最好的选择,我不得不使用武力指数查询中。我永远不会明白为什么有时会发生这种情况,可能有时引擎让这个错误?</p> <p><b>答:</b>发动机可以犯错误。如果你想了解更多关于这样的错误我推荐你去尝试<sp一个n id="urvanov-syntax-highlighter-64c910928ec51168069230" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n><span class="crayon-h"></span><span class="crayon-st">格式</sp一个n><span class="crayon-o">=</sp一个n><span class="crayon-st">JSON</sp一个n></span></span>中描述的<一个href="//m.doggingzone.com/blog/2016/04/06/explain-format-json-wrap-up/">这些系列</一个>以及研究<一个href="https://dev.mysql.com/doc/internals/en/optimizer-tracing.html">优化器跟踪</一个>。而不同的格式的<sp一个n id="urvanov-syntax-highlighter-64c910928ec53923056156" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n></span></span>不改变查询计划,<sp一个n id="urvanov-syntax-highlighter-64c910928ec54795109750" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n><span class="crayon-h"></span><span class="crayon-st">格式</sp一个n><span class="crayon-o">=</sp一个n><span class="crayon-st">JSON</sp一个n></span></span>提供更多信息用于解析查询的优化。</p> <p><b>问:</b>我有一个问题关于状态。关于你提到的Handler_read。正在执行查询的时候一直在增加。如果服务器的正常运行时间超过14天,有1000每秒,处理程序将在数百万的范围。一旦我们做一个查询调优车间,我想重置处理程序计数器。如何执行?(看看:同样的时间范围,是否Handler_read减少)</p> <p><b>答:</b>为会话使用重置计数器<sp一个n id="urvanov-syntax-highlighter-64c910928ec56477897832" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">冲洗</sp一个n><span class="crayon-h"></span><span class="crayon-st">状态</sp一个n></span></span>声明。然后你可以运行原来的语句并检查需要做什么工作在引擎来解决它。</p> <p>这是伪代码,如何做到这一点:</p> <div id="urvanov-syntax-highlighter-64c910928ec57960255228" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">冲洗状态;<查询>运行显示状态像“处理程序%”;</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec57960255228-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec57960255228-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec57960255228-3"> 3</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec57960255228-1"> <span class="crayon-st">冲洗</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">状态</sp一个n>;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec57960255228-2"> <span class="crayon-h"><</sp一个n>运行<sp一个n class="crayon-h"></span>你的<sp一个n class="crayon-h"></span>查询<sp一个n class="crayon-h">></sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec57960255228-3"> <span class="crayon-st">显示</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">状态</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">就像</sp一个n> <span class="crayon-h"></span>”<sp一个n class="crayon-st">处理程序</sp一个n>%’;</div> </div></td> </tr> </tbody> </table> </div> </div> <p><b>问:</b>你能说一下解释扩展吗?我们如何用它来进一步帮助我们调优查询?它显示完整的查询服务器/优化器将执行正确的格式吗?</p> <p><b>答:</b><span id="urvanov-syntax-highlighter-64c910928ec59768595712" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n><span class="crayon-h"></span><span class="crayon-st">扩展</sp一个n></span></span>包含在标准输出的吗<sp一个n id="urvanov-syntax-highlighter-64c910928ec5a665215075" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-v">解释</sp一个n></span></span>5.7版本以来的命令。如果你早些时候开始使用MySQL和首选<sp一个n id="urvanov-syntax-highlighter-64c910928ec5c048127157" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n></span></span>命令你现在注意到两个差异。</p> <p>首先,这是一<sp一个n id="urvanov-syntax-highlighter-64c910928ec5d731308717" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">“过滤”</sp一个n></span>列。这一列显示多少行输出优化器将被丢弃。例如,对于查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec5e597182794" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >解释从工资选择工资,工资在158000 - 159000年间\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 1 select_type:简单的表:工资分区:空类型:所有possible_keys:零键:空key_len:零参考:空行:2838426过滤:11.11额外的:使用1行组,1警告(0 00秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec5e597182794-15"> 15</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">解释</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-r">之间的</sp一个n> <span class="crayon-h"></span>158000年<sp一个n class="crayon-h"></span> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>159000 \ G</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-2"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-3"> id:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-4"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>简单的</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-5"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>工资</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-6"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-7"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-8"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-9"> <span class="crayon-h"></span> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-10"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-11"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-12"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>2838426</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-13"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>11.11</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-14"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec5e597182794-15"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n>,<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span>警告<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>预计,这款发动机将读2838426行,但只有11.11%的人会被用来得到最终结果。这通常表明查询并不是有效的。</p> <p>相反,查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec60482540305" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >解释从标题选择不同的(标题)\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 1 select_type:简单的表:标题分区:空类型:指数possible_keys:主键:主要key_len: 209裁判:空行:442189过滤:100.00额外的:使用索引;使用临时1行组,1警告(0 00秒)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec60482540305-15"> 15</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">解释</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">截然不同的</sp一个n>(标题)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>标题\ G</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-2"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-3"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-4"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>简单的</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-5"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>标题</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-6"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-7"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">指数</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-8"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">主</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-9"> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-r">主</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-10"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span>209年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-11"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-12"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>442189年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-13"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-14"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">指数</sp一个n>;<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">临时</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec60482540305-15"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n>,<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span>警告<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>将使用所有442189检索行创建最终的结果集(过滤:100.00)。</p> <p>的另一个特点<sp一个n id="urvanov-syntax-highlighter-64c910928ec61246540606" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n><span class="crayon-h"></span><span class="crayon-st">扩展</sp一个n></span></span>在5.7版本之前和常规<sp一个n id="urvanov-syntax-highlighter-64c910928ec63258753799" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n></span></span>自版本5.7,它返回一个查询优化器是重写的诊断领域,可访问的<sp一个n id="urvanov-syntax-highlighter-64c910928ec64863882446" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">显示</sp一个n><span class="crayon-h"></span><span class="crayon-st">警告</sp一个n></span></span>命令。</p> <p>例如,让我们来查询:</p> <div id="urvanov-syntax-highlighter-64c910928ec66699286627" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">选择列出first_name、last_name从员工中列出(选择列出从工资工资=(从工资选择马克斯(工资)));</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec66699286627-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec66699286627-2"> 2</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec66699286627-1"> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec66699286627-2"> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资);</div> </div></td> </tr> </tbody> </table> </div> </div> <p>然后运行<sp一个n id="urvanov-syntax-highlighter-64c910928ec67102233011" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">解释</sp一个n></span></span>,紧随其后的是<sp一个n id="urvanov-syntax-highlighter-64c910928ec68984473037" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">显示</sp一个n><span class="crayon-h"></span><span class="crayon-st">警告</sp一个n></span></span>:</p> <div id="urvanov-syntax-highlighter-64c910928ec6a813444537" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >解释选择列出first_name、last_name从员工- >中列出(选择列出从工资工资=(从工资选择马克斯(工资)))\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 1 select_type:主要表:员工分区:空类型:所有possible_keys:主键:空key_len:零参考:空行:299113过滤:100.00额外的:空* * * * * * * * * * * * * * * * * * * * * * * * * * * 2。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 1 select_type:主要表:< subquery2 >分区:空类型:eq_ref possible_keys: < auto_distinct_key >关键:< auto_distinct_key > key_len: 4裁判:劳工。列出行:1过滤:100.00额外的:空* * * * * * * * * * * * * * * * * * * * * * * * * * * 3。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 2 select_type:物化表:工资分区:空类型:所有possible_keys:主键:空key_len:零参考:空行:2838426过滤:10.00额外的:使用* * * * * * * * * * * * * * * * * * * * * * * * * * * 4。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 3 select_type:子查询表:工资分区:空类型:所有possible_keys:零键:空key_len:零参考:空行:2838426过滤:100.00额外:零4行集,1警告(0 00秒)mysql >显示警告\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * *水平:注意代码:1003信息:/ *选择# 1 * /选择的员工。员工。列出的是“列出”、“员工的员工。“first_name”作为“first_name”,“员工”。“员工“last_name”。作为 `last_name` from `employees`.`employees` semi join (`employees`.`salaries`) where ((`<subquery2>`.`emp_no` = `employees`.`employees`.`emp_no`) and (`employees`.`salaries`.`salary` = (/* select#3 */ select max(`employees`.`salaries`.`salary`) from `employees`.`salaries`))) 1 row in set (0,00 sec)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-57"> 57</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-58"> 58</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-59"> 59</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-60"> 60</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-61"> 61年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-62"> 62年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-63"> 63年</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-64"> 64年</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6a813444537-65"> 65年</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">解释</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-2"> <span class="crayon-h"></span>- - - - - -<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资))\ G</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-3"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-4"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-5"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span> <span class="crayon-r">主</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-6"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-7"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-8"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-9"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">主</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-10"> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-11"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-12"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-13"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>299113年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-14"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-15"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-16"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>2。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-17"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-18"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span> <span class="crayon-r">主</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-19"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-h"><</sp一个n>subquery2<sp一个n class="crayon-h">></sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-20"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-21"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span>eq_ref</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-22"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-h"><</sp一个n>auto_distinct_key<sp一个n class="crayon-h">></sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-23"> <span class="crayon-h"></span> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-h"><</sp一个n>auto_distinct_key<sp一个n class="crayon-h">></sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-24"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span>4</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-25"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span>employees.employees.emp_no</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-26"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-27"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-28"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-29"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>3所示。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-30"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>2</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-31"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>物化</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-32"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>工资</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-33"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-34"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-35"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">主</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-36"> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-37"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-38"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-39"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>2838426</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-40"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>10.00</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-41"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-42"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>4所示。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-43"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-44"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>子查询</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-45"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>工资</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-46"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-47"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-48"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-49"> <span class="crayon-h"></span> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-50"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-51"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-52"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>2838426</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-53"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-54"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-55"> 4<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n>,<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span>警告<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-56"></div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-57"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">显示</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>\ G</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-58"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-59"> 水平:<sp一个n class="crayon-h"></span>请注意</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-60"> 代码:<sp一个n class="crayon-h"></span>1003年</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-61"> 信息:<sp一个n class="crayon-h"></span> <span class="crayon-c">/ *选择# 1 * /</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>“员工”。“员工列出的。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“列出”、“员工。“员工“first_name”。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“first_name”,</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-62"> “员工”。“员工“last_name”。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“last_name”<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工”,“员工”<sp一个n class="crayon-h"></span>半<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>(“员工的“工资”)。<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-63"> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>(('<sp一个n class="crayon-h"><</sp一个n>subquery2<sp一个n class="crayon-h">></sp一个n>“。”列出“<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>“员工”。“员工列出)。<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-64"> <span class="crayon-r">和</sp一个n> <span class="crayon-h"></span>(‘员工’。‘工资’。‘工资’<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-c">/ *选择# 3 * /</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(‘员工’。‘工资’。‘工资’)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工的“工资”)))。</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6a813444537-65"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>在<sp一个n id="urvanov-syntax-highlighter-64c910928ec6c244427685" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">显示</sp一个n><span class="crayon-h"></span><span class="crayon-st">警告</sp一个n></span></span>输出,可以看到,优化器使用semi-join优化查询:它实际上的子查询转换为<sp一个n id="urvanov-syntax-highlighter-64c910928ec6d025623264" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">加入</sp一个n></span></span>。同样的查询可以写成:</p> <div id="urvanov-syntax-highlighter-64c910928ec6e056944172" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">选择列出first_name、last_name使用(列出),从员工加入工资工资=(选择马克斯(工资)从工资);</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec6e056944172-1"> 1</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec6e056944172-1"> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> <span class="crayon-st">加入</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n>(列出)<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资);</div> </div></td> </tr> </tbody> </table> </div> </div> <p>如果我们关掉semi-join优化我们将看到一个不同的警告:</p> <div id="urvanov-syntax-highlighter-64c910928ec70570378751" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" show" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"> <div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"> <div class="urvanov-syntax-highlighter-button-icon"></div> </div> <span class="crayon-language">MySQL</sp一个n> </div> </div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"> <textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;">mysql >设置optimizer_switch = ' semijoin = off”;查询好,0行影响(0 00秒)mysql >解释选择列出first_name、last_name从员工中列出(选择列出从工资工资=(从工资选择马克斯(工资)))\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 1 select_type:主要表:员工分区:空类型:所有possible_keys:零键:空key_len:零参考:空行:299113过滤:100.00额外的:使用* * * * * * * * * * * * * * * * * * * * * * * * * * * 2。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 2 select_type:子查询表:工资分区:空类型:所有possible_keys:主键:空key_len:零参考:空行:2838426过滤:10.00额外的:使用* * * * * * * * * * * * * * * * * * * * * * * * * * * 3。行* * * * * * * * * * * * * * * * * * * * * * * * * * * id: 3 select_type:子查询表:工资分区:空类型:所有possible_keys:零键:空key_len:零参考:空行:2838426过滤:100.00额外:零3行集,1警告(0 00秒)mysql >显示警告\ G * * * * * * * * * * * * * * * * * * * * * * * * * * * 1。行* * * * * * * * * * * * * * * * * * * * * * * * * * *水平:注意代码:1003信息:/ *选择# 1 * /选择的员工。员工。列出的是“列出”、“员工的员工。“first_name”作为“first_name”,“员工”。“员工“last_name”。作为 `last_name` from `employees`.`employees` where <in_optimizer>(`employees`.`employees`.`emp_no`,`employees`.`employees`.`emp_no` in ( <materialize> (/* select#2 */ select `employees`.`salaries`.`emp_no` from `employees`.`salaries` where (`employees`.`salaries`.`salary` = (/* select#3 */ select max(`employees`.`salaries`.`salary`) from `employees`.`salaries`)) ), <primary_index_lookup>(`employees`.`employees`.`emp_no` in <temporary table> on <auto_distinct_key> where ((`employees`.`employees`.`emp_no` = `<materialized_subquery>`.`emp_no`))))) 1 row in set (0,00 sec)</textarea> </div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tbody> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-1"> 1</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-2"> 2</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-3"> 3</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-4"> 4</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-5"> 5</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-6"> 6</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-7"> 7</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-8"> 8</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-9"> 9</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-10"> 10</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-11"> 11</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-12"> 12</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-13"> 13</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-14"> 14</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-15"> 15</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-16"> 16</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-17"> 17</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-18"> 18</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-19"> 19</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-20"> 20.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-21"> 21</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-22"> 22</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-23"> 23</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-24"> 24</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-25"> 25</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-26"> 26</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-27"> 27</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-28"> 28</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-29"> 29日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-30"> 30.</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-31"> 31日</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-32"> 32</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-33"> 33</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-34"> 34</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-35"> 35</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-36"> 36</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-37"> 37</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-38"> 38</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-39"> 39</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-40"> 40</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-41"> 41</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-42"> 42</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-43"> 43</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-44"> 44</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-45"> 45</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-46"> 46</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-47"> 47</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-48"> 48</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-49"> 49</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-50"> 50</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-51"> 51</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-52"> 52</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-53"> 53</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-54"> 54</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-55"> 55</div> <div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-56"> 56</div> <div class="crayon-num" data-line="urvanov-syntax-highlighter-64c910928ec70570378751-57"> 57</div> </div></td> <td class="urvanov-syntax-highlighter-code"> <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-1"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>optimizer_switch =<sp一个n class="crayon-s">“semijoin =了”</sp一个n>;</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-2"> 查询<sp一个n class="crayon-h"></span>好吧,<sp一个n class="crayon-h"></span>0<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span>影响<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-3"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-4"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">解释</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span>first_name、<sp一个n class="crayon-h"></span>last_name<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>员工<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>列出<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>工资<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(工资)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>工资))\ G</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-5"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-6"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>1</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-7"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span> <span class="crayon-r">主</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-8"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>员工</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-9"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-10"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-11"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-12"> <span class="crayon-h"></span> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-13"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-14"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-15"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>299113年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-16"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-17"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-18"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>2。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-19"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>2</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-20"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>子查询</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-21"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>工资</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-22"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-23"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-24"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">主</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-25"> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-26"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-27"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-28"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>2838426</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-29"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>10.00</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-30"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">使用</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在哪里</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-31"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>3所示。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-32"> <span class="crayon-h"></span>id:<sp一个n class="crayon-h"></span>3</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-33"> <span class="crayon-h"></span>select_type:<sp一个n class="crayon-h"></span>子查询</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-34"> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n>:<sp一个n class="crayon-h"></span>工资</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-35"> <span class="crayon-h"></span> <span class="crayon-st">分区</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-36"> <span class="crayon-h"></span> <span class="crayon-t">类型</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">所有</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-37"> possible_keys:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-38"> <span class="crayon-h"></span> <span class="crayon-st">关键</sp一个n>:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-39"> <span class="crayon-h"></span>key_len:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-40"> <span class="crayon-h"></span>裁判:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-41"> <span class="crayon-h"></span> <span class="crayon-st">行</sp一个n>:<sp一个n class="crayon-h"></span>2838426</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-42"> <span class="crayon-h"></span>过滤:<sp一个n class="crayon-h"></span>100.00</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-43"> <span class="crayon-h"></span>额外的:<sp一个n class="crayon-h"></span> <span class="crayon-st">零</sp一个n> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-44"> 3<sp一个n class="crayon-h"></span> <span class="crayon-st">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n>,<sp一个n class="crayon-h"></span>1<sp一个n class="crayon-h"></span>警告<sp一个n class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-45"></div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-46"> mysql<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">显示</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">警告</sp一个n>\ G</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-47"> * * * * * * * * * * * * * * * * * * * * * * * * * * *<sp一个n class="crayon-h"></span>1。<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span>* * * * * * * * * * * * * * * * * * * * * * * * * * *</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-48"> 水平:<sp一个n class="crayon-h"></span>请注意</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-49"> 代码:<sp一个n class="crayon-h"></span>1003年</div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-50"> 信息:<sp一个n class="crayon-h"></span> <span class="crayon-c">/ *选择# 1 * /</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>“员工”。“员工列出的。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“列出”、“员工。“员工“first_name”。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“first_name”,</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-51"> “员工”。“员工“last_name”。<sp一个n class="crayon-h"></span> <span class="crayon-st">作为</sp一个n> <span class="crayon-h"></span>“last_name”<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工”,“员工”<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-52"> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span> <span class="crayon-h"><</sp一个n>in_optimizer<sp一个n class="crayon-h">></sp一个n>(“雇员”,“员工”,列出的员工。“员工列出的。<sp一个n class="crayon-h"></span> </div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-53"> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-h"></span> <span class="crayon-h"><</sp一个n>实现<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span>(<sp一个n class="crayon-c">/ *选择# 2 * /</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span>‘员工’。‘工资’。‘列出<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工的“工资”。<sp一个n class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-54"> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>(‘员工’。‘工资’。‘工资’<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>(<sp一个n class="crayon-c">/ *选择# 3 * /</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">选择</sp一个n> <span class="crayon-h"></span> <span class="crayon-e ">马克斯</sp一个n>(‘员工’。‘工资’。‘工资’)<sp一个n class="crayon-h"></span> <span class="crayon-st">从</sp一个n> <span class="crayon-h"></span>“员工的“工资”)。<sp一个n class="crayon-h"></span>),</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-55"> <span class="crayon-h"></span> <span class="crayon-h"><</sp一个n>primary_index_lookup<sp一个n class="crayon-h">></sp一个n>(“雇员”。“员工列出的。<sp一个n class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-h"><</sp一个n> <span class="crayon-st">临时</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">表</sp一个n> <span class="crayon-h">></sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-h"><</sp一个n>auto_distinct_key<sp一个n class="crayon-h">></sp一个n> <span class="crayon-h"></span> </div> <div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-56"> <span class="crayon-st">在哪里</sp一个n> <span class="crayon-h"></span>(“雇员”。“员工列出的。<sp一个n class="crayon-h"></span>=<sp一个n class="crayon-h"></span>”<sp一个n class="crayon-h"><</sp一个n>materialized_subquery<sp一个n class="crayon-h">></sp一个n>'。'列出')))))</div> <div class="crayon-line" id="urvanov-syntax-highlighter-64c910928ec70570378751-57"> 1<sp一个n class="crayon-h"></span> <span class="crayon-t">行</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">在</sp一个n> <span class="crayon-h"></span> <span class="crayon-st">集</sp一个n> <span class="crayon-h"></span>(0,00<sp一个n class="crayon-h"></span>sec)</div> </div></td> </tr> </tbody> </table> </div> </div> <p>这个特性可以帮助理解为什么一个或使用特定的优化。</p> <p><b>问:</b>你有没有使用mysqltuner perl脚本,如果是这样的话,你会认为这是一个短期的选择吗?</p> <p><b>答:</b>你的意思是<一个href="https://github.com/major/MySQLTuner-perl">https://github.com/major/MySQLTuner-perl</一个>吗?</p> <p>我只是我的笔记本电脑上运行它,这是我的建议:</p> <blockquote> <p>推荐- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -</p> <p>一般建议:</p> <p>减少或消除打开连接和网络问题</p> <p>配置您的帐户和ip子网,然后用skip-name-resolve = 1更新您的配置</p> </blockquote> <p>这可能是好的,除非你想从外部提供您的MySQL服务器。</p> <blockquote> <p>我们将建议提高join_buffer_size直到连接不使用索引。</p> <p>参见https://dev.mysql.com/doc/internals/en/join-buffer-size.html</p> <p>(特殊页面的底部的结论)。</p> </blockquote> <p>我不明白为什么提高<sp一个n id="urvanov-syntax-highlighter-64c910928ec72536245709" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">join_buffer_size</sp一个n></span>如果不是我使用所需的查询。它也可能是危险的,如果连接数量增加。</p> <blockquote> <p>改变innodb_log_file_size之前和/或innodb_log_files_in_group读:<一个href="https://bit.ly/2TcGgtU">https://bit.ly/2TcGgtU</一个></p> </blockquote> <p>它总是好的阅读用户手册之前改变选项。我建议你每次你跟随性能调优建议。甚至我的。</p> <blockquote> <p>变量来调整:</p> <p>join_buffer_size (> 256.0 k,或总是使用索引和连接)</p> </blockquote> <p>这不能表示没有检查查询。</p> <blockquote> <p>如果可能的话,通过innodb_buffer_pool_size (> = 713.2)。</p> </blockquote> <p>这个结论是根据我的数据大小,这是理智的我的笔记本电脑,32 g RAM。但如果数据量大于RAM的机器上的这个建议不会帮助你识别的理想InnoDB缓冲池大小。在这种情况下,我建议你从这开始<一个href="//m.doggingzone.com/blog/2007/11/03/choosing-innodb_buffer_pool_size/">博客</一个>最后按照链接。</p> <blockquote> <p>innodb_log_file_size应该(= 16米)如果可能,所以InnoDB总日志文件大小等于25%的缓冲池大小。</p> </blockquote> <p>InnoDB重做日志文件大小应该保存尽可能多的数据,所以InnoDB可以刷新数据从缓冲池和重用日志空间,没有执行咄咄逼人<一个href="https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-flushing.html">冲洗</一个>。</p> <p>如果你有一个小活动数据集但是你写很多你可能InnoDB总日志文件大小大于25%的缓冲池大小。或者,如果你有一个大的数据集,但你的工作量几乎是阅读,你可能非常小的重做日志文件。这个建议本身没有任何意义。</p> <p>总之,我可以说,MySQL调谐器是一个产品,你的MySQL或MariaDB实例执行静态分析和建议,根据其作者认为的最佳实践是什么。</p> <p>不幸的是,它不可能优化MySQL相同的方式为所有用例。InnoDB重做日志文件大小超过只是一个例子。还有其他选项,应调整根据不同的工作负载。</p> <p>我建议你研究产品的使用和理解,为什么你改变。最好从一个问题开始:“我需要解决的问题?”而不是修改随机选择。</p> <p>对于通用服务器,运行在专用的机器上,您可以使用的选项<一个href="https://dev.mysql.com/doc/refman/8.0/en/innodb-dedicated-server.html">-innodb-dedicated-server</一个>。不过,在我看来,它也远非理想。</p> <p><b>问:</b>基于混合吗?</p> <p><b>答:</b>这是幻灯片的问题“异步副本”,解释了二进制日志格式如何影响复制性能?Mixed-based二进制日志格式指示MySQL日志中的一切<sp一个n id="urvanov-syntax-highlighter-64c910928ec74500233120" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">声明</sp一个n></span>默认情况下,自动切换到格式<sp一个n id="urvanov-syntax-highlighter-64c910928ecb0154277341" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-t">行</sp一个n></span></span>格式当用户命令,不安全的问题<sp一个n id="urvanov-syntax-highlighter-64c910928ecb5801302894" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">声明</sp一个n></span>格式。这意味着安全查询缓慢的源服务器和复制<sp一个n id="urvanov-syntax-highlighter-64c910928ecb7537498302" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">声明</sp一个n></span>格式,会经历相同的复制品的性能问题。不安全的查询不受这一行为的影响,但他们修改表<sp一个n id="urvanov-syntax-highlighter-64c910928ecb8229434964" class="urvanov-syntax-highlighter-syntax urvanov-syntax-highlighter-syntax-inline crayon-theme-classic crayon-theme-classic-inline urvanov-syntax-highlighter-font-monaco" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important;"><span class="crayon-pre urvanov-syntax-highlighter-code" style="font-size: 12px !important; line-height: 15px !important;font-size: 12px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><span class="crayon-st">主键</sp一个n></span></span>定义的。否则,复制将不得不做一个全表扫描为每一行更新。</p> <div id="jp-relatedposts" 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