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faq: update the description of "Information schema is out of date" #18660

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Sep 20, 2024
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faq: update the description of "Information schema is out of date" #18660

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2 changes: 1 addition & 1 deletion faq/sql-faq.md
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Expand Up @@ -286,7 +286,7 @@ TiDB 在执行 SQL 语句时，会根据隔离级别确定一个对象的 `schem

### 触发 Information schema is out of date 错误的原因？

在 v6.5.0 之前，当执行 DML 时，TiDB 超过一个 DDL lease 时间（默认 45s）没能加载到最新的 schema 就可能会报 `Information schema is out of date` 的错误。遇到此错的可能原因如下：
当执行 DML 时，TiDB 超过一个 DDL lease 时间（默认 45s）没能加载到最新的 schema 就可能会报 `Information schema is out of date` 的错误。遇到此错的可能原因如下：

- 执行此 DML 的 TiDB 被 kill 后准备退出，且此 DML 对应的事务执行时间超过一个 DDL lease，在事务提交时会报这个错误。
- TiDB 在执行此 DML 时，有一段时间内连不上 PD 或者 TiKV，导致 TiDB 超过一个 DDL lease 时间没有 load schema，或者导致 TiDB 断开与 PD 之间带 keep alive 设置的连接。
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