Oracle version 18c.
I have setup Data Guard between two RAC.
I have used RMAN duplicate command to create standby database and it finished successfully: RMAN> duplicate target database for standby from active database nofilenamecheck dorecover;
Started apply process: SQL> alter database recover managed standby database disconnect from session;
But when I check alert log on the primary instance I see the following error:
ORA-03816: Message 3816 not found; product=RDBMS; facility=ORA
During that time I am able to connect to the standby database using sqlplus from primary and vice versa.