1 前言在应用的开发过程中，由于开发初期的数据量一般都比较小，所以开发过程中一般都比较注重功能上的实现，但是当完成了一个应用或者系统之后，随着生产数据量的急剧增长，那么之前的很多sql语句的写法就会显现出一定的性能问题，对生产的影响也会越来越大，这些不恰当的sql语句就会成为整个系统性能的瓶颈，为了追求系统的极致性能，必须要对它们进行优化。这篇文章开始后面的几篇文章将结合自己平时工作和学习中的知....

问答 2022-03-30 来自：开发者社区

SQL性能调优通过explain analyze执行计划时，计划项目都包括什么啊？

问答 2022-03-30 来自：开发者社区

SQL性能调优通过explain执行计划时，计划项目都包括什么啊？

阿里云文档 2022-03-30

如何通过EXPLAIN语句解释SQL语句的执行计划

该语句用于解释SQL语句的执行计划，包括SELECT、DELETE、INSERT、REPLACE或UPDATE语句。

文章 2021-10-29 来自：开发者社区

SQL 手册-实用 SQL 语句-EXPLAIN 和执行计划

与多数数据库系统类似，PolarDB-X在处理SQL时，会通过优化器生成执行计划，该执行计划由关系操作符构成一个树形结构，反映PolarDB-X如何执行SQL语句；不同的是，PolarDB-X本身不存储数据，更侧重考虑分布式环境中的网络IO开销，将运算下推到各个分库（如RDS MySQL）执行，从而提升SQL执行效率。用户可通过EXPLAIN命令查看SQL的执行计划。本文着重介绍PolarDB-....

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