How to fix the Oracle error ORA-02439: Unique index on a deferrable constraint is not allowed?

In this post, you’ll learn more about the Oracle ErrorORA-02439: Unique index on a deferrable constraint is not allowed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-02439: Unique index on a deferrable constraint is not allowed

Reason for the Error ORA-02439: Unique index on a deferrable constraint is not allowed

attempted to enable a deferrable primary key/unique constraint that has an existing unique index on the constraint columns.

How to fix the Error ORA-02439: Unique index on a deferrable constraint is not allowed ?

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

Drop the index on the constraint columns or make the constraint not deferrable.