Scenario : Power outage at your data center brought down the databases in the DG configuration.
Solution : Start up the primary database
SQL> startup
: startup mount the standby database
SQL> startup mount
Login to Primary node and start dgmgrl
DGMGRL> connect sys/password
DGMGRL> enable configuration;
DGMGRL> enable fast_start failover;
DGMGRL> show configuration;
It should show you the primary database and physical standby database
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