How to fix the Oracle error ORA-01146: cannot start online backup – file string is already in backup?

In this post, you’ll learn more about the Oracle ErrorORA-01146: cannot start online backup – file string is already in backup with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01146: cannot start online backup – file string is already in backup

Reason for the Error ORA-01146: cannot start online backup – file string is already in backup

When starting an online backup it was noticed that an online backup was already started for one of the data files.

How to fix the Error ORA-01146: cannot start online backup – file string is already in backup ?

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

End the first backup before beginning another.