How to fix the Oracle error ORA-23478: object group “string” is already mastered at string?

In this post, you’ll learn more about the Oracle ErrorORA-23478: object group “string” is already mastered at string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-23478: object group “string” is already mastered at string

Reason for the Error ORA-23478: object group “string” is already mastered at string

There is at least one other materialized view repgroup at the local site with the same group name but a different master site.

How to fix the Error ORA-23478: object group “string” is already mastered at string ?

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

Ensure that all materialized view repgroups at the local site with the same group name have the same master.