diff --git a/mysql-schema/mysql-schema.md b/mysql-schema/mysql-schema.md index 797878f23db0d..f977a0b27ad3c 100644 --- a/mysql-schema/mysql-schema.md +++ b/mysql-schema/mysql-schema.md @@ -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