How to fix the Oracle error ORA-38425: attribute set used for an index object may not be unassigned?

In this post, you’ll learn more about the Oracle ErrorORA-38425: attribute set used for an index object may not be unassigned with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-38425: attribute set used for an index object may not be unassigned

Reason for the Error ORA-38425: attribute set used for an index object may not be unassigned

An attempt was made to un-assign an attribute set from an expression set when there is an Expression Filter index defined on the column.

How to fix the Error ORA-38425: attribute set used for an index object may not be unassigned ?

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

Drop the index before un-assigning the attribute set.