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update system variable #11505

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merged 2 commits into from
Oct 9, 2022
Merged

update system variable #11505

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332d8ad
fix system variable doc
xiongjiwei Oct 8, 2022
7561c7f
Update system-variables.md
TomShawn Oct 9, 2022
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4 changes: 2 additions & 2 deletions system-variables.md
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Expand Up @@ -147,7 +147,7 @@ mysql> SELECT * FROM t1;
- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 默认值：`utf8mb4_bin`
- 该变量表示默认数据库中所使用的排序规则。与 MySQL 中的 `collation_database` 一致。
- 该变量表示当前数据库默认所使用的排序规则。与 MySQL 中的 `collation_database` 一致。 **不建议设置此变量**， 当前使用的数据库变动时，此变量会被 TiDB 修改。
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### `collation_server`

Expand Down Expand Up @@ -232,7 +232,7 @@ mysql> SELECT * FROM t1;

### `last_insert_id` <span class="version-mark">从 v5.3.0 版本开始引入</span>

- 返回 `LAST_INSERT_ID()` 的结果。这个变量是一个只读变量，与 MySQL 中的 `last_insert_id` 一致。
- 返回由 INSERT 语句产生的最新 `AUTO_INSCRENT` 或者 `AUTO_RANDOM` 值，与 `LAST_INSERT_ID()` 的返回的结果相同。与 MySQL 中的 `last_insert_id` 一致。
- 作用域：SESSION
- 默认值：`0`

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