https://anTtutu.github.io/tags/%E4%BC%98%E5%8C%96/ Recent content in 优化 on Anttu's Blog Hugo zh-CN Fri, 11 Dec 2020 08:00:00 +0800 https://anTtutu.github.io/post/2020-12-11-mysql-daily-commands/ Fri, 11 Dec 2020 08:00:00 +0800 https://anTtutu.github.io/post/2020-12-11-mysql-daily-commands/ <h2 id="前言">前言</h2> <p>攒的一些 mysql 日常巡检命令和优化散记，合在一起记录。巡检部分用 show status/variables 就能完成，优化部分是建表和索引设计层面的经验，标注了适用版本。</p> <h2 id="1日常巡检命令">1、日常巡检命令</h2> <h3 id="11-最后一条语句的报错信息">1.1 最后一条语句的报错信息</h3> <div class="highlight"><div style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"> <table style="border-spacing:0;padding:0;margin:0;border:0;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5 </span></code></pre></td> <td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-sql" data-lang="sql"><span style="display:flex;"><span><span style="color:#57606a">-- 显示最后一个执行语句产生的错误、警告和通知 </span></span></span><span style="display:flex;"><span><span style="color:#cf222e">show</span><span style="color:#fff"> </span>warnings<span style="color:#1f2328">;</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#57606a">-- 只显示错误 </span></span></span><span style="display:flex;"><span><span style="color:#cf222e">show</span><span style="color:#fff"> </span>errors<span style="color:#1f2328">;</span><span style="color:#fff"> </span></span></span></code></pre></td></tr></table> </div> </div><p>调试 SQL 时比看客户端提示更全，写存储过程排查尤其有用。</p>