【六袆 - MySQL】SQL优化；Explain SQL执行计划分析；
Explain SQL执行计划分析
- 概念：
- English Unit
- 案例分析
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- 1.分析的SQL
- 2.执行计划分析 【如图】
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- MySQL执行计划参数以及它们的影响或意义：
概念：
MySQL执行计划（Execution Plan）是数据库系统根据查询语句生成的一种执行策略，用于指导数据库引擎执行查询操作。
English Unit
This chapter explains how to optimize MySQL performance and provides examples. Optimization involves configuring, tuning, and measuring performance, at several levels. Depending on your job role (developer, DBA, or a combination of both), you might optimize at the level of individual SQL statements, entire applications, a single database server, or multiple networked database servers. Someti