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fix typo #77

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merged 2 commits into from
Oct 23, 2020
Merged

fix typo #77

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typo
Ozarklake Jul 8, 2020
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typo
Ozarklake Aug 20, 2020
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typo
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@Ozarklake
Ozarklake authored Jul 8, 2020
commit e14180fe7aabd1c3bef1bafc218ff6f5d72184ed
2 changes: 1 addition & 1 deletion ch7.md
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Expand Up @@ -290,7 +290,7 @@ SELECT COUNT（*）FROM emails WHERE recipient_id = 2 AND unread_flag = true

### 快照隔离和可重复读

如果只从表面上看读已提交隔离级别你就认为它完成了事务所需的一切，那是可以原谅的。它允许**中止**（原子性的要求）；它防止读取不完整的事务结果，并且防止并发写入造成的混合。事实上这些功能非常有用，比起没有事务的系统来，可以提供更多的保证。
如果只从表面上看读已提交隔离级别你就认为它完成了事务所需的一切，那是可以原谅的。它允许**中止**（原子性的要求）；它防止读取不完整的事务结果，并且防止并发写入造成的混乱。事实上这些功能非常有用，比起没有事务的系统来，可以提供更多的保证。

但是在使用此隔离级别时，仍然有很多地方可能会产生并发错误。例如[图7-6](img/fig7-6.png)说明了读已提交时可能发生的问题。

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