How to fix the Oracle error ORA-16666: unable to initiate fast-start failover on a bystander standby database?

In this post, you’ll learn more about the Oracle ErrorORA-16666: unable to initiate fast-start failover on a bystander standby database with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-16666: unable to initiate fast-start failover on a bystander standby database

Reason for the Error ORA-16666: unable to initiate fast-start failover on a bystander standby database

The request to initiate a fast-start failover using DBMS_DG.INITIATE_FS_FAILOVER was made on a bystander standby database. DBMS_DG.INITIATE_FS_FAILOVER can only be called on either the primary or fast-start failover target standby database.

How to fix the Error ORA-16666: unable to initiate fast-start failover on a bystander standby database ?

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

Call DBMS_DG.INITIATE_FS_FAILOVER on either the primary or fast-start failover target standby database.