12c关于DMON你应该知道的！

The Oracle Data Guard monitor process (DMON) is an Oracle background process that runs on every database instance that is managed by the broker. When you start the Oracle Data Guard broker, a DMON process is created.

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--DMON是一个Oracle后台进程，随着数据库实例的启动而启动。

Whether you use Cloud Control or DGMGRL to manage a database, the DMON process is the server-side component that interacts with the local database and the DMON processes of the other databases to perform the requested function. The DMON process is also responsible for monitoring the health of the broker configuration and for ensuring that every database has a consistent description of the configuration.

--DMON进程是服务端组件，它是用来负责监控broker配置的健康状况，确保每个数据库都有一份一致的配置。

当我们使用dgmgrl /这个客户端命令的时候，脑海里要一个一张图。

12c 关于DMON你应该知道的！

接下来我们做一个测试，看看这个DMON进程异常被KILL掉后会怎样。

[root@roidb01 ~]# ps -ef|grep dmon

root 1651 1547 0 21:02 pts/2 00:00:00 grep --color=auto dmon

oracle 27802 1 0 20:34 ? 00:00:00 ora_dmon_orcl

[root@roidb01 ~]# kill -9 27802

[root@roidb01 ~]#