How to fix the Oracle error ORA-29383: all leaves of top-plan string must be consumer groups?

In this post, you’ll learn more about the Oracle ErrorORA-29383: all leaves of top-plan string must be consumer groups with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-29383: all leaves of top-plan string must be consumer groups

Reason for the Error ORA-29383: all leaves of top-plan string must be consumer groups

An attempt was made to create or modify the specified top-plan but it has some plans as leaves.

How to fix the Error ORA-29383: all leaves of top-plan string must be consumer groups ?

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

To identify which plans and/or plan directives need to be modified, look at all plans that have no plan directives. Then, alter the top-plan so that all its leaves are consumer groups.