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Add docs about the cluster_id row in mysql.tidb table #20280

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Add docs about the cluster_id row in mysql.tidb table #20280

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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 @@ These system tables contain grant information about user accounts and their priv
* `tidb_server_version`: the version information of TiDB when it is initialized. Note that this value is read-only and cannot be modified.
* `system_tz`: the system time zone of TiDB.
* `new_collation_enabled`: whether TiDB has enabled the [new framework for collations](/character-set-and-collation.md#new-framework-for-collations). Note that this value is read-only and cannot be modified.
* `cluster_id`: the unique identifier of the TiDB cluster. Note that this value is read-only and cannot be modified.

## Server-side help system tables

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