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Apr 25, 2019
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一条sql语句在mysql中如何执行的中的错别字 #288

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2 changes: 1 addition & 1 deletion docs/database/一条sql语句在mysql中如何执行的.md
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Expand Up @@ -138,7 +138,7 @@ update tb_student A set A.age='19' where A.name=' 张三 ';

## 三 总结

* MySQL 主要分为 Server 曾和引擎层，Server 层主要包括连接器、查询缓存、分析器、优化器、执行器，同时还有一个日志模块（binlog），这个日志模块所有执行引擎都可以共用,redolog 只有 InnoDB 有。
* MySQL 主要分为 Server 层和引擎层，Server 层主要包括连接器、查询缓存、分析器、优化器、执行器，同时还有一个日志模块（binlog），这个日志模块所有执行引擎都可以共用,redolog 只有 InnoDB 有。
* 引擎层是插件式的，目前主要包括，MyISAM,InnoDB,Memory 等。
* 查询语句的执行流程如下：权限校验（如果命中缓存）---》查询缓存---》分析器---》优化器---》权限校验---》执行器---》引擎
* 更新语句执行流程如下：分析器----》权限校验----》执行器---》引擎---redo log(prepare 状态---》binlog---》redo log(commit状态)
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