How to fix the Oracle error QSM-01125: a more optimal set operator materialized view than string was used to rewrite?

In this post, you’ll learn more about the Oracle ErrorQSM-01125: a more optimal set operator materialized view than string was used to rewrite with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-01125: a more optimal set operator materialized view than string was used to rewrite

Reason for the Error QSM-01125: a more optimal set operator materialized view than string was used to rewrite

Query Rewrite always chooses the most optimal set operator materialized view based on parameters, such as cardinality of the set operator materialized view, number of branches that the set operator materialized view can rewrite etc. The set operator materialized view specified was found to be less optimal.

How to fix the Error QSM-01125: a more optimal set operator materialized view than string was used to rewrite ?

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

To force using a set operator materialized view, consider using a rewrite hint.