これがまだ存在するの8.0.17バージョンに一つだけ、現在複製された状態変数の組、将来は、我々は、単一のマスタモードでは、破棄され、読み取りと書き込みのノードされたノードを参照するために使用することができます。
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2087
Server version: 8.0.17 MySQL Community Server - GPL
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show status like 'group_replication_primary_member'; +----------------------------------+--------------------------------------+ | Variable_name | Value | +----------------------------------+--------------------------------------+ | group_replication_primary_member | 1fb894d8-e752-11e9-a0a1-00505687032a | +----------------------------------+--------------------------------------+ 1 row in set (0.00 sec) group_replication_primary_member Shows the primary member's UUID when the group is operating in single-primary mode. If the group is operating in multi-primary mode, shows an empty string. The group_replication_primary_member status variable has been deprecated and is scheduled to be removed in a future version.