Oracle Solution for Error ora-16655

ORA-16655: specified target standby database invalid

What triggered the Error:

The attempted command was not allowed because fast-start failover was enabled for this Data Guard configuration and the target standby database specified in the command differs from the standby database that was indicated by the FastStartFailoverTarget property associated with the current primary database.

What should we do to fix it:

Retry the attempted command by specifying the standby database that is indicated by the FastStartFailoverTarget property that is associated with the current primary database. Alternatively, fast-start failover may be disabled. Then retry the command using the originally specified target standby database.