Common Errors :
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ORA-16795: database resource guard detects that database re-creation is required
ORA-16825: Fast-Start Failover and other errors or warnings detected for the database
ORA-16817: unsynchronized Fast-Start Failover configuration
ORA-16820: Fast-Start Failover observer is no longer observing this database
Data Guard Broker commands:
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DGMGRL> show configuration verbose;
DGMGRL> show database
DGMGRL> show database
DGMGRL> reinstate database
If required restart observer
DGMGRL> stop observer
DGMGRL> start observer
