监控主动-主动集群

在 Amazon RDS for MySQL 中监控主动-主动集群，对于跟踪性能、复制完整性和节点同步至关重要。您可以通过连接到集群中的数据库实例并运行以下 SQL 命令来监控您的主动-主动集群：

SELECT * FROM performance_schema.replication_group_members;

输出应针对每个数据库实例的 MEMBER_STATE 显示 ONLINE，如以下示例输出所示：

+---------------------------+--------------------------------------+----------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST    | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+----------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 9854d4a2-5d7f-11ee-b8ec-0ec88c43c251 | ip-10-15-3-137 |        3306 | ONLINE       | PRIMARY     | 8.0.35         | MySQL                      |
| group_replication_applier | 9e2e9c28-5d7f-11ee-8039-0e5d58f05fef | ip-10-15-3-225 |        3306 | ONLINE       | PRIMARY     | 8.0.35         | MySQL                      |
| group_replication_applier | a6ba332d-5d7f-11ee-a025-0a5c6971197d | ip-10-15-1-83  |        3306 | ONLINE       | PRIMARY     | 8.0.35         | MySQL                      |
+---------------------------+--------------------------------------+----------------+-------------+--------------+-------------+----------------+----------------------------+
3 rows in set (0.00 sec)

有关可能的 MEMBER_STATE 值的信息，请参阅 MySQL 文档中的 Group Replication Server States。