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system-variable: the value of ‘tidb_service_scope’ becomes case-insensitive in v9.0.0 and v8.5.6 #21422

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system-variable: the value of ‘tidb_service_scope’ becomes case-insensitive in v9.0.0 and v8.5.6 #21422

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Expand Up @@ -5019,7 +5019,7 @@ EXPLAIN FORMAT='brief' SELECT COUNT(1) FROM t WHERE a = 1 AND b IS NOT NULL;
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：字符串
- 默认值：""
- 可选值：长度小于或等于 64 的字符串，可用合法字符包括数字 `0-9`、字母 `a-zA-Z`、下划线 `_` 和连字符 `-`
- 可选值：长度小于或等于 64 的字符串，可用合法字符包括数字 `0-9`、字母 `a-zA-Z`、下划线 `_` 和连字符 `-`。从 v8.5.6 版本开始，该变量的取值大小写不敏感。系统会将输入值转换为小写形式进行存储和比较。
- 该变量是一个实例级别的变量，用于控制 [TiDB 分布式执行框架](/tidb-distributed-execution-framework.md)下各 TiDB 节点的服务范围。分布式执行框架会根据该变量的值决定将分布式任务调度到哪些 TiDB 节点上执行，具体规则请参考[任务调度](/tidb-distributed-execution-framework.md#任务调度)。

### `tidb_session_alias` <span class="version-mark">从 v7.4.0 版本开始引入</span>
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