How to fix the error ORA-00407: rolling upgrade from release string.string to string.string is not allowed?

In this post, you’ll learn more about the Oracle ErrorORA-00407: rolling upgrade from release string.string to string.string is not allowed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00407: rolling upgrade from release string.string to string.string is not allowed

Reason for the Error ORA-00407: rolling upgrade from release string.string to string.string is not allowed

Another instance executing software at a different point release already has the database mounted.

How to fix the Error ORA-00407: rolling upgrade from release string.string to string.string is not allowed ?

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

Shutdown all instances then startup with the new software.