How to fix the Oracle error ORA-38851: cannot mark the current instance (redo thread) as disabled?

In this post, you’ll learn more about the Oracle ErrorORA-38851: cannot mark the current instance (redo thread) as disabled with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-38851: cannot mark the current instance (redo thread) as disabled

Reason for the Error ORA-38851: cannot mark the current instance (redo thread) as disabled

The standby switchover or failover operation failed because it needs to mark the current instance (redo thread) as disabled.

How to fix the Error ORA-38851: cannot mark the current instance (redo thread) as disabled ?

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

Shut down this instance and start up using a different instance name or redo thread number and retry.