How to fix the Oracle error ORA-01666: control file is for a standby database?

In this post, you’ll learn more about the Oracle ErrorORA-01666: control file is for a standby database with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01666: control file is for a standby database

Reason for the Error ORA-01666: control file is for a standby database

Attempting to mount, recover, or open a standby database without the appropriate command option to designate a standby database.

How to fix the Error ORA-01666: control file is for a standby database ?

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

Use the standby option or appropriate commands, or mount with the primary control file.