Found error in standby database alert log.
The DG status was still normal when impact this issue.
It should be caused by delaying of the network, or the disk devices are busy in the standby database.
RFS[16]: Archived Log: 'P:\ARC\ARC17613_0632327728.001'
Sat May 02 10:35:35 2009
Errors in file c:\oracle\product\10.2.0\admin\mrpc\bdump\mrpc_arc1_1868.trc:
ORA-16146: standby destination control file enqueue unavailable
Sat May 02 10:35:40 2009
Errors in file c:\oracle\product\10.2.0\admin\mrpc\udump\mrpc_rfs_1556.trc:
ORA-16146: standby destination control file enqueue unavailable
Error: ORA-16146 (ORA-16146)
Text: standby destination control file enqueue unavailable
---------------------------------------------------------------------------
Cause: The target standby destination control file is currently
unavailable to the Remote File Server (RFS) process. This
indicates that the target destination is the primary database
itself.
Action: Check for and eliminate the standby destination archive log
parameter in question.
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