How to fix the Oracle error ORA-30556: either functional or bitmap join index is defined on the column to be modified?

In this post, you’ll learn more about the Oracle ErrorORA-30556: either functional or bitmap join index is defined on the column to be modified with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30556: either functional or bitmap join index is defined on the column to be modified

Reason for the Error ORA-30556: either functional or bitmap join index is defined on the column to be modified

An ALTER TABLE MODIFY COLUMN was issued on a column on which either a functional index or bitmap join index exists.

How to fix the Error ORA-30556: either functional or bitmap join index is defined on the column to be modified ?

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

Drop the functional or bitmap join index before attempting to modify the column.