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Add docs about cluster_id row in mysql.tidb #19831

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Add docs about cluster_id row in mysql.tidb #19831

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1 change: 1 addition & 0 deletions mysql-schema/mysql-schema.md
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Expand Up @@ -34,6 +34,7 @@ aliases: ['/docs-cn/dev/system-tables/system-table-overview/','/docs-cn/dev/refe
* `tidb_server_version` 用于记录 TiDB 在初始化时的版本信息，注意该值为只读，不可修改。
* `system_tz` 用于记录 TiDB 的系统时区
* `new_collation_enabled` 用于记录 TiDB 是否开启了[新排序规则框架](/character-set-and-collation.md#新框架下的排序规则支持)，注意该值为只读，不可修改。
* `cluster_id` 用于记录 TiDB 集群的唯一标识，注意该值为只读，不可修改。

## 服务端帮助信息系统表

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