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Update 数据库系统原理.md

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高性能 MYSQL 在事务隔离级别中还有一个概念为加锁读。
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Yongtao Zhang 2018-09-11 14:32:05 +08:00 committed by GitHub
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@ -294,12 +294,12 @@ SELECT ... FOR UPDATE;
----
| 隔离级别 | 脏读 | 不可重复读 | 幻影读 |
| :---: | :---: | :---:| :---: |
| 未提交读 | √ | √ | √ |
| 提交读 | × | √ | √ |
| 可重复读 | × | × | √ |
| 可串行化 | × | × | × |
| 隔离级别 | 脏读 | 不可重复读 | 幻影读 | 加锁读 |
| :---: | :---: | :---:| :---: | :---: |
| 未提交读 | √ | √ | √ | × |
| 提交读 | × | √ | √ | × |
| 可重复读 | × | × | √ | × |
| 可串行化 | × | × | × | √ |
# 五、多版本并发控制