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Update system-variables.md
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hfxsd authored Sep 19, 2024
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Expand Up @@ -4620,7 +4620,7 @@ EXPLAIN FORMAT='brief' SELECT COUNT(1) FROM t WHERE a = 1 AND b IS NOT NULL;
- 类型:整数型
- 默认值:`0`
- 范围:`[0, 15]`
- 该变量用于设置新建表的默认行 ID 的分片位数。当设置了该变量为非 0 值后,执行 `CREATE TABLE` 语句时,TiDB 会将为允许使用 `SHARD_ROW_ID_BITS` 的表(如NONCLUSTERED 表)自动设定该属性。详细说明见 [`SHARD_ROW_ID_BITS`](/shard-row-id-bits.md)。
- 该变量用于设置新建表的默认行 ID 的分片位数。当设置了该变量为非 0 值后,执行 `CREATE TABLE` 语句时,TiDB 会将为允许使用 `SHARD_ROW_ID_BITS` 的表(如 NONCLUSTERED 表)自动设定该属性。详细说明见 [`SHARD_ROW_ID_BITS`](/shard-row-id-bits.md)。

### `tidb_simplified_metrics`

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