How to fix the Oracle error ORA-15164: cluster rolling downgrade incomplete?

In this post, you’ll learn more about the Oracle ErrorORA-15164: cluster rolling downgrade incomplete with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15164: cluster rolling downgrade incomplete

Reason for the Error ORA-15164: cluster rolling downgrade incomplete

The cluster was still performing rolling downgrade.

How to fix the Error ORA-15164: cluster rolling downgrade incomplete ?

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

Ensure that all the instances in the cluster are downgraded before retrying the command.