Oracle Error ORA-03173: Standby may not be synced with primary

Oracle Error Message

ORA-03173: Standby may not be synced with primary

Reason for the Error

ALTER SESSION SYNC WITH PRIMARY did not work because either the standby was not synchronous or in a data-loss mode with regard to the primary, or the standby recovery was terminated.

Solution

Make the standby synchronous and no-data-loss with regard to the primary. Make the standby recovery active.