監控作用中叢集

在 Amazon RDS for MySQL 中監控作用中叢集對於追蹤效能、複寫完整性和節點同步至關重要。您可以連線至叢集中的資料庫執行個體，並執行下列SQL命令來監控作用中叢集：

SELECT * FROM performance_schema.replication_group_members;

您的輸出應ONLINE會顯示每個資料庫執行個體MEMBER_STATE的 ，如下列範例輸出所示：

+---------------------------+--------------------------------------+----------------+-------------+--------------+-------------+----------------+----------------------------+
| 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)

如需有關可能MEMBER_STATE值的資訊，請參閱我的SQL文件中的群組複寫伺服器狀態。