SHOW DB_DISCOVERY HEARTBEATS 语法用于查询指定逻辑库中的数据库发现心跳。
ShowDatabaseDiscoveryHeartbeats::=
'SHOW' 'DB_DISCOVERY' 'HEARTBEATS' ('FROM' databaseName)?
databaseName ::=
identifier
databaseName 时，默认是当前使用的 DATABASE。 如果也未使用 DATABASE 则会提示 No database selected。| 列 | 说明 |
|---|---|
| name | 数据库发现心跳名称 |
| props | 数据库发现心跳参数 |
SHOW DB_DISCOVERY HEARTBEATS FROM discovery_db;
mysql> SHOW DB_DISCOVERY HEARTBEATS FROM discovery_db;
+-------------------+---------------------------------+
| name | props |
+-------------------+---------------------------------+
| group_0_heartbeat | {keep-alive-cron=0/5 * * * * ?} |
+-------------------+---------------------------------+
1 row in set (0.00 sec)
SHOW DB_DISCOVERY HEARTBEATS;
mysql> SHOW DB_DISCOVERY HEARTBEATS;
+-------------------+---------------------------------+
| name | props |
+-------------------+---------------------------------+
| group_0_heartbeat | {keep-alive-cron=0/5 * * * * ?} |
+-------------------+---------------------------------+
1 row in set (0.00 sec)
SHOW、DB_DISCOVERY、HEARTBEATS、FROM