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Fix stale read note #6525

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ti-chi-bot merged 1 commit into from
Jun 24, 2021
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Fix stale read note #6525

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2 changes: 1 addition & 1 deletion as-of-timestamp.md
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Expand Up @@ -40,7 +40,7 @@ TiDB 支持通过标准 SQL 接口，即通过 `AS OF TIMESTAMP` SQL 语法的
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> 除了指定时间戳，`AS OF TIMESTAMP` 语法最常用使用的方式是读几秒前的数据。如果采用这种方式，推荐读 5 秒以上的历史数据。
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> 使用 Stale Read 时需要为 TiDB 和 PD 节点部署 NTP 服务，防止 TiDB 指定的时间戳超过当前最新的 TSO 分配进度（如几秒后的时间戳），或者超前于 GC safe point 的时间戳。当指定的时间戳超过服务范围，TiDB 会产生报错或者等待事务提交等行为。
> 使用 Stale Read 时需要为 TiDB 和 PD 节点部署 NTP 服务，防止 TiDB 指定的时间戳超过当前最新的 TSO 分配进度（如几秒后的时间戳），或者落后于 GC safe point 的时间戳。当指定的时间戳超过服务范围，TiDB 会产生报错或者等待事务提交等行为。
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> `Prepare` 语句与 `AS OF TIMESTAMP` 语法的兼容支持尚不完善，不推荐同时使用。

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