性能分析要说sql有问题，需要拿出证据，因此需要性能分析Mysql查询优化器（Mysql Query Optimizer）1.Mysql中有专门负责优化SELECT语句的优化器模块，主要功能：通过计算分析系统中收集到的统计信息，为客户端请求的Query提供他认为最优的执行计划(它认为最优的数据检索方式，不见得是DBA认为是最优的，这部分最耗费时间，如果知道mysql底层是如何执行一条sql，可以....

文章 2022-05-20 来自：开发者社区

几个必须掌握的SQL优化技巧(三)：Explain分析执行计划

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....

文章 2021-12-26 来自：开发者社区

MySQL数据库性能优化由浅入深（表设计、慢查询、SQL索引优化、Explain分析、Show Profile分析、配置优化）

文章目录0 SQL性能分析1 表的设计合理化1.1 为什么需要范式1.2 三范式原理1.3 什么样的表才满足三范式2 慢查询2.1 慢查询介绍2.2 慢查询步骤3 添加适当索引3.1 索引是什么3.2 索引优劣势3.3 索引分类和建索引命令语句3.4 创建索引情况分析4 Explain分析（重点）4.1 Explain介绍4.2 id（表的读取顺序）4.3 select_type（数据读取操作....

文章 2017-06-26 来自：开发者社区

SAP HANA SQL执行计划(SAP HANA SQL explain plan)（SQL 优化分析）

SQL Explain Plan主要用户分析和优化sql查询，有两种实现方式：方式一：在sql editor中右键实现可视化的分析：点击Explain Plan,结果如下：点击Visual Plan，结果如下：方式二：通过SQL语句的方式创建SQL Explain Plan：之后在表 Explain_Plan_Table中查询：专注于企业信...

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