How to fix the Oracle error ORA-16854: apply lag could not be determined?

In this post, you’ll learn more about the Oracle ErrorORA-16854: apply lag could not be determined with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-16854: apply lag could not be determined

Reason for the Error ORA-16854: apply lag could not be determined

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.

How to fix the Error ORA-16854: apply lag could not be determined ?

You can fix this error in Oracle by following the below steps

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.