MySQL逻辑模块工作配合_MySQL
启动MySQL
1、初始化模块执行&&存储引擎初期化执行
2、1中执行完成后 ---->连接管理模块接手
3、连接管理模块启动处理客户端连接请求的监听程序（tcp/ip 网络监听、unix 的socket）
4、启动完成、准备接收请求
5、监听到客户端的连接请求（运用网络交互模块中相关功能）---->通过Client & Server 交互协议模块协议----通讯匹配---->
6、连接管理模块----请求转发---->线程管理模块----控制转交---->连接线程模块
7、连接线程模块----调用---->用户模块进行授权检查----通过---->线程池请求线程
8、开启日志的情况下，日志会同步产生
query类型请求（调用Parser（Query 解析和转发模块））---->(访问控制模块同步执行)
---->(select 类型)调用查询缓存模块---->检查query cache 中是否已经存在---->存在将cache 中的数据返回给连接线程模块
不存在传回query 解析器(Query 优化器模块)
---->（DML 或者DDL）给表变更管理模块
---->表维护模块(更新统计信息、检测、修复和整理类的query)
---->复制模块(复制相关的query)
---->状态收集报告模块(请求状态的query)
command类型请求---->直接执行（不需要调用Parser）
9、以上执行完成---->连接线程模块---->返回执行结果
附上图片：
MySQL各个模块的关系图
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