ORA-16854: apply lag could not be determined

ORA-16854: apply lag could not be determined


Cause:


Apply lag could not be determined because either apply services were not running or there was no connectivity between the redo source and standby database.



Action:


Start apply services if they are not running. Also, ensure that there is network connectivity between the redo source and standby databases, and the redo source is sending redo data to the standby.