How to fix the Oracle error ORA-16658: unobserved fast-start failover configuration?

In this post, you’ll learn more about the Oracle ErrorORA-16658: unobserved fast-start failover configuration with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-16658: unobserved fast-start failover configuration

Reason for the Error ORA-16658: unobserved fast-start failover configuration

The fast-start failover configuration was currently unobserved so failover was disallowed.

How to fix the Error ORA-16658: unobserved fast-start failover configuration ?

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

Make sure the observer is running and has connectivity to both the primary and the target standby databases. Otherwise, disable fast-start failover to perform a failover in the absence of the observer process.