How to fix the Oracle error ORA-15163: cluster is not in the rolling downgrade to string?

In this post, you’ll learn more about the Oracle ErrorORA-15163: cluster is not in the rolling downgrade to string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15163: cluster is not in the rolling downgrade to string

Reason for the Error ORA-15163: cluster is not in the rolling downgrade to string

The cluster was not in the rolling downgrade.

How to fix the Error ORA-15163: cluster is not in the rolling downgrade to string ?

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

Start the rolling downgrade using the ALTER SYSTEM START ROLLING MIGRATION command from another ASM instance and restart this instance.