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sysvar: add tidb_enable_strict_not_null_check #21600

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sysvar: add tidb_enable_strict_not_null_check #21600

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sysvar: add tidb_enable_strict_not_null_check
xhebox Apr 30, 2026
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Update system-variables.md
xhebox May 6, 2026
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qiancai May 7, 2026
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Update system-variables.md
qiancai May 7, 2026
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10 changes: 10 additions & 0 deletions system-variables.md
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Expand Up @@ -2479,6 +2479,16 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 默认值：`ON`
- 这个变量用来控制是否开启 statement summary 功能。如果开启，SQL 的耗时等执行信息将被记录到系统表 `information_schema.STATEMENTS_SUMMARY` 中，用于定位和排查 SQL 性能问题。

### `tidb_enable_strict_not_null_check` <span class="version-mark">从 v9.0.0 版本开始引入</span>

- 作用域：SESSION | 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`
- 这个变量用来控制是否可以插入 `null` 到非空列，关闭时允许此类插入。该设置的目的是提供一个从 TiDB 早期版本升级的方法，因为早期版本在验证类型方面不太严格。
- 该变量的默认值 `ON` 与 MySQL 兼容。
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### `tidb_enable_strict_double_type_check` <span class="version-mark">从 v5.0 版本开始引入</span>

- 作用域：SESSION | GLOBAL
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