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Update ch12.md #171

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Expand Up @@ -579,7 +579,7 @@ COMMIT;

及时性意味着确保用户观察到系统的最新状态。我们之前看到，如果用户从陈旧的数据副本中读取数据，它们可能会观察到系统处于不一致的状态（请参阅“[复制延迟问题](ch5.md#复制延迟问题)”）。但这种不一致是暂时的，而最终会通过等待与重试简单地得到解决。

CAP定理（请参阅“[线性一致性的代价](ch9.md#线性一致性的代价)”）使用**线性一致性（linearizability）** 意义上的一致性，这是实现及时性的强有力方法。像**写后读**这样及时性更弱的一致性也很有用（请参阅“[读己之写](ch5.md#读己之写)”）也很有用。
CAP定理（请参阅“[线性一致性的代价](ch9.md#线性一致性的代价)”）使用**线性一致性（linearizability）** 意义上的一致性，这是实现及时性的强有力方法。像**写后读**这样及时性更弱的一致性也很有用（请参阅“[读己之写](ch5.md#读己之写)”）。

* 完整性（Integrity）

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