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【宋红康 MySQL数据库 】【高级篇】【06】MySQL的逻辑架构
2022-06-22 07:38:00 【lpruoyu】
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【宋红康 MySQL数据库 】【高级篇】【06】MySQL的逻辑架构
逻辑架构剖析
服务器处理客户端请求





Connectors

第一层 连接层



第二层 服务层





PS:查询缓存组件使用SQL语句作为key,查询结果作为value;命中率很低,很鸡肋。
第三层 引擎层
mysql> show engines;


存储层

小结


SQL执行流程

MySQL中的SQL执行流程

1. 查询缓存




推荐做法:(注意:MySQL8.0不可以使用查询缓存)

不使用查询缓存:



2. 解析器





3. 优化器




4. 执行器








总结
- 查询缓存
- 解析器:词法分析、语法分析、语义检查 ——> 解析树
- 优化器:逻辑优化、物理优化 ——> 执行计划
- 执行器:调用存储引擎API执行
MySQL8.0中SQL执行原理

1. 确认profiling是否开启


2. 多次执行相同SQL查询

3. 执行profiles

4. 查看profile




MySQL5.7中SQL执行原理






SQL语法顺序


数据库缓冲池

缓冲池 vs 查询缓存





缓冲池如何读取数据


查看/设置缓存池的大小


多个Buffer cache实例



引申问题



参考
尚硅谷宋红康: MySQL数据库(入门到高级,菜鸟到大牛).
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