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notes/数据库系统原理.md
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@ -14,7 +14,7 @@
* [封锁粒度](#封锁粒度)
* [封锁类型](#封锁类型)
* [封锁协议](#封锁协议)
* [MySQL 隐式与显示锁定](#mysql-隐式与显示锁定)
* [MySQL 隐式与显式锁定](#mysql-隐式与显式锁定)
* [四、隔离级别](#四隔离级别)
* [未提交读（READ UNCOMMITTED）](#未提交读read-uncommitted)
* [提交读（READ COMMITTED）](#提交读read-committed)
@ -217,7 +217,7 @@ lock-x(A)...lock-s(B)...lock-s(C)...unlock(A)...unlock(C)...unlock(B)
lock-x(A)...unlock(A)...lock-s(B)...unlock(B)...lock-s(C)...unlock(C)
```
### MySQL 隐式与显示锁定
### MySQL 隐式与显式锁定
MySQL 的 InnoDB 存储引擎采用两段锁协议，会根据隔离级别在需要的时候自动加锁，并且所有的锁都是在同一时刻被释放，这被称为隐式锁定。