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mysql 基础架构

server层

完成客户端连接、权限校验及提前处理优化的工作

连接器

mysql -h$ip -u$user -ppassword
show processlist; # 查看连接状态

查询缓存

8.0版本去除了

分析器

词法分析
语法分析

优化器

多索引决定使用哪个索引
多join决定各个表的链接顺序

执行器

首先判断对表是否有权限
有索引 查接口
没索引 调用引擎接口按行读取
rows_examined记录扫描行数

内置函数

存储过程、触发器、视图等

存储引擎

负责数据的存储和提取，插件式的架构模式

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