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variable: tidb_enable_ts_validation #20357

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variable: tidb_enable_ts_validation #20357

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9 changes: 9 additions & 0 deletions system-variables.md
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Expand Up @@ -2504,6 +2504,15 @@ Query OK, 0 rows affected (0.09 sec)
> - 如果 PD leader 的 TSO RPC 延迟升高，但其现象并非由 CPU 使用率达到瓶颈而导致（可能存在网络等问题），此时，打开 TSO Follower Proxy 可能会导致 TiDB 的语句执行延迟上升，从而影响集群的 QPS 表现。
> - 该功能与 [`tidb_tso_client_rpc_mode`](#tidb_tso_client_rpc_mode-从-v840-版本开始引入) 不兼容。启用该功能将导致 [`tidb_tso_client_rpc_mode`](#tidb_tso_client_rpc_mode-从-v840-版本开始引入) 不生效。

### `tidb_enable_ts_validation`

- 作用域：GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：布尔型
- 默认值：`ON`
- 这个变量用于控制是否在 TiDB 发送请求到 TiKV 时验证时间戳。如果识别到带有非法时间戳的请求，TiDB 会拒绝该请求，以避免数据损坏。

### `tidb_enable_unsafe_substitute` <span class="version-mark">从 v6.3.0 版本开始引入</span>

- 作用域：SESSION | GLOBAL
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