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flashback: add limitation with stale read/snapshot #18903

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merged 5 commits into from
Dec 16, 2024
Merged

flashback: add limitation with stale read/snapshot #18903

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93d8960
flashback: add limitation with stale read/snapshot
3pointer Oct 25, 2024
0775bb2
Update sql-statements/sql-statement-flashback-cluster.md
3pointer Oct 25, 2024
1e61981
Update sql-statements/sql-statement-flashback-cluster.md
3pointer Oct 30, 2024
cc7eee2
fix format issues
qiancai Nov 6, 2024
fa02fe9
Update sql-statements/sql-statement-flashback-cluster.md
qiancai Dec 16, 2024
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1 change: 1 addition & 0 deletions sql-statements/sql-statement-flashback-cluster.md
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Expand Up @@ -13,6 +13,7 @@ TiDB v6.5.6、v7.1.3、v7.5.1、v7.6.0 开始引入了 `FLASHBACK CLUSTER TO TSO
> **警告：**
>
> 在指定恢复时间点时，请务必检查 TIMESTAMP 或 TSO 的有效性，避免指定可能超过 PD 当前分配的最大 TSO（参考 Grafana PD 面板上 `Current TSO`）的未来时间。否则，可能破坏并发处理线性一致性以及事务隔离级别，导致严重的数据正确性的问题。
> 在执行 FLASHBACK 时，数据不会通过事务进行清理。请确保在 FLASHBACK 完成后，未来使用 TiDB 的任何历史版本读取功能（如 Stale Read 或 Set Snapshot）时，选择的时间点不要落在 FLASHBACK 运行的时间范围内。如果读取的历史版本包含未完成的 FLASHBACK 数据，可能破坏并发处理线性一致性以及事务隔离级别，导致严重的数据正确性的问题。
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> **警告：**
>
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