How to fix the Oracle error ORA-23312: not the masterdef according to string?

In this post, you’ll learn more about the Oracle ErrorORA-23312: not the masterdef according to string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-23312: not the masterdef according to string

Reason for the Error ORA-23312: not the masterdef according to string

The group name is null, the group name is misspelled, the invocation or given database is not the masterdef, or one of the masters does not believe the invocation database is the masterdef.

How to fix the Error ORA-23312: not the masterdef according to string ?

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

If the given group name and masterdef were both correct, connect to the masterdef and retry the request, or relocate the masterdef at the (errant) databases using relocate_masterdef.