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MYSQL 逻辑架构_MySQL

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Jun 01, 2016 pm 01:49 PM

storagemind Mapping

bitsCN.com

思维导图

前言》 Mysql并非尽善尽美，但足够灵活，能适应高要求环境，如Web应用。》 Mysql在众多平台上运行良好，支持多种数据类型，但不支持对象类型（Mongodb支持）》 Mysql的存储引擎可以基于表建立，以满足对数据存储，性能，特征及其他特性的各种需要。架构逻辑视图

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

> 在解析查询之前，服务器会“询问”是否进行了查询缓存(只能缓存SELECT语句和相应结果)。缓存过的直接返回结果，未缓存的就需要进行解析查询，优化，重新执行返回结果。 > 解析查询时会创建一个内部数据结构(树)，然后对其进行各种优化。 > 优化:重写查询，决定查询的读表顺序，选择需使用的索引。参考文献《高性能Mysql》 bitsCN.com

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