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alaister123 2021-04-01 18:25:16 -07:00
parent 156f7a67f4
commit c2eec88851
1 changed files with 2 additions and 2 deletions
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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) * [封锁粒度](#封锁粒度)
* [封锁类型](#封锁类型) * [封锁类型](#封锁类型)
* [封锁协议](#封锁协议) * [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) * [四、隔离级别](#四隔离级别)
* [未提交读（READ UNCOMMITTED）](#未提交读read-uncommitted) * [未提交读（READ UNCOMMITTED）](#未提交读read-uncommitted)
* [提交读（READ COMMITTED）](#提交读read-committed) * [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) 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。 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。