How to fix the Oracle error ORA-16649: possible failover to another database prevents this database from being opened?

In this post, you’ll learn more about the Oracle ErrorORA-16649: possible failover to another database prevents this database from being opened with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-16649: possible failover to another database prevents this database from being opened

Reason for the Error ORA-16649: possible failover to another database prevents this database from being opened

An attempt to open the primary database was made either after a failover occurred, or when it was likely to have occurred as the result of the primary being isolated from the fast-start failover target standby database and from the fast-start failover observer.

How to fix the Error ORA-16649: possible failover to another database prevents this database from being opened ?

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

Check if a failover did occur. If fast-start failover is enabled, and a failover did not occur, ensure that connectivity exists between the primary database and either the observer or the target standby database. Then, try opening the database again.