https://axerzone.cn/tags/mysql/Recent content in MySQL on Weiming's BlogHugo -- gohugo.iozh-cn© 2026 WeimingTue, 20 Aug 2024 00:00:00 +0000https://axerzone.cn/posts/mysql-transaction-mvcc/Tue, 20 Aug 2024 00:00:00 +0000https://axerzone.cn/posts/mysql-transaction-mvcc/<h1 class="relative group">MySQL 事务和 MVCC，面试必问 <div id="mysql-事务和-mvcc面试必问" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#mysql-%e4%ba%8b%e5%8a%a1%e5%92%8c-mvcc%e9%9d%a2%e8%af%95%e5%bf%85%e9%97%ae" aria-label="锚点">#</a> </span> </h1> <p>事务和 MVCC 是 MySQL 面试里出场率最高的话题，没有之一。我准备秋招的时候翻来覆去看了好几遍，现在总算能说清楚了。</p> <h2 class="relative group">ACID 四大特性 <div id="acid-四大特性" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#acid-%e5%9b%9b%e5%a4%a7%e7%89%b9%e6%80%a7" aria-label="锚点">#</a> </span> </h2> <p>事务四个特性，关键是理解怎么实现的：</p>https://axerzone.cn/posts/mysql-index-optimization/Sat, 15 Jun 2024 00:00:00 +0000https://axerzone.cn/posts/mysql-index-optimization/<h1 class="relative group">MySQL 索引优化，别再全表扫描了 <div id="mysql-索引优化别再全表扫描了" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#mysql-%e7%b4%a2%e5%bc%95%e4%bc%98%e5%8c%96%e5%88%ab%e5%86%8d%e5%85%a8%e8%a1%a8%e6%89%ab%e6%8f%8f%e4%ba%86" aria-label="锚点">#</a> </span> </h1> <p>上学期数据库课的大作业，我写了个选课系统。数据量小的时候跑得飞快，一导入几万条测试数据就卡得不行。一查原因——全表扫描。那时候才真正意识到索引有多重要。</p> <h2 class="relative group">B+树——索引的底层结构 <div id="b树索引的底层结构" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#b%e6%a0%91%e7%b4%a2%e5%bc%95%e7%9a%84%e5%ba%95%e5%b1%82%e7%bb%93%e6%9e%84" aria-label="锚点">#</a> </span> </h2> <p>MySQL 的 InnoDB 引擎用 B+树组织索引。</p>