一般DG安装完之后，或者在运行中，我们都会通过一个重要的视图v$managed_standby监控各进程的状态，以及归档应用情况。
比如下面在standby 上查询如下，这里主库是RAC：
SQL> select process,status,thread#,sequence# from v$managed_standby order by 3,1;

PROCESS STATUS THREAD# SEQUENCE#
--------- ------------ ---------- ----------
RFS IDLE 0 0
RFS IDLE 0 0
RFS IDLE 0 0
RFS IDLE 0 0
ARCH CLOSING 1 13411
ARCH CLOSING 1 13412
RFS IDLE 1 13413
ARCH CLOSING 2 8849
ARCH CLOSING 2 4101
MRP0 APPLYING_LOG 2 8850
RFS IDLE 2 8850
这里，process就是进程名，包括ARCH, RFS, MRP0等，对应英文解释如下：
Type of the process whose information is being reported:

RFS - Remote file server----接收进程
MRP0 - Detached recovery server process----恢复进程
MR(fg) - Foreground recovery session
ARCH - Archiver process
FGRD
LGWR
RFS(FAL)
RFS(NEXP)
LNS - Network server process

重要的是status字段，表示当前的进程状态，先看英文解释如下：

UNUSED - No active process
ALLOCATED - Process is active but not currently connected to a primary database
CONNECTED - Network connection established to a primary database
ATTACHED - Process is actively attached and communicating to a primary database
IDLE - Process is not performing any activities
ERROR - Process has failed
OPENING - Process is opening the archived redo log
CLOSING - Process has completed archival and is closing the archived redo log
WRITING - Process is actively writing redo data to the archived redo log
RECEIVING - Process is receiving network communication
ANNOUNCING - Process is announcing the existence of a potential dependent archived redo log
REGISTERING - Process is registering the existence of a completed dependent archived redo log
WAIT_FOR_LOG - Process is waiting for the archived redo log to be completed
WAIT_FOR_GAP - Process is waiting for the archive gap to be resolved
APPLYING_LOG - Process is actively applying the archived redo log to the standby database

中文解释如下：
ALLOCATED: 正在准备但还未连接主库
ATTACHED: 正在连接到主库
CONNECTED:已经连接到主库
IDLE:空闲
ERROR：失败的进程，需要关注
RECEIVING:归档日志接收中
OPENING:归档日志处理中
CLOSING:归档日志处理完，正在收尾中
WRITING: 进程在将REDO数据写向归档文件中
WAIT_FOR_LOG:等待新的REDO归档数据中
WAIT_FOR_GAP:归档有中断，正在等待中断的那部分REDO数据.
APPLYING_LOG:正在应用REDO归档数据到备库

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监控DG视图v$managed_standby字段注解

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