MYSQL 逻辑架构_MySQL
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思维导图
每个虚线框为一层，总共三层。
第一层，服务层(为客户端服务):为请求做连接处理，授权认证，安全等。
第二层，核心层:查询解析，分析，优化，缓存，提供内建函数;存储过程，触发器，视图。
第三层，存储引擎层，不光做存储和提取数据，而且针对特殊数据引擎还要做事务处理。
连接管理与安全性(第一层 服务层) > 处理流程
Δ 每个连接的查询都在一个进程中的线程完成。
Δ 服务器负责缓存线程，所以服务层不需要为每个连接新建线程。> 认证流程
优化与执行
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