Cause:

The network between primary and standby must be broken

ERROR:

ORA-16664: unable to receive the result from a database
DGM-17017: unable to determine configuration status

SOLUTION:

• Check lại tnsnames.ora (đường dẫn, sid, _DGMGRL)
• Nếu ok hết rồi thì restart configuration

DGMGRL> disable configuration;
DGMGRL> enable configuration;

• Restart DG Broker

SQL> alter system set dg_broker_start=false;

System altered.

SQL> alter system set dg_broker_start=true;

System altered.