Oracle Solution for Error ora-16644

ORA-16644: apply instance not available

What triggered the Error:

The broker operation could not finish, because it requires a running apply instance for the standby database, and either there was no such instance designated for the standby database or the designated apply instance was not currently available.

What should we do to fix it:

Start the designated apply instance or wait until the broker specifies an instance to be the apply instance and reissue the command.