How to fix the Oracle error ORA-30751: cannot disable column string from storing objects of type string.string?

In this post, you’ll learn more about the Oracle ErrorORA-30751: cannot disable column string from storing objects of type string.string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30751: cannot disable column string from storing objects of type string.string

Reason for the Error ORA-30751: cannot disable column string from storing objects of type string.string

The user is trying to drop a type from being stored in a substitutable column or table. This error is raised due to one of the following reasons :

– the column is enabled to store instances of some subtype of the type being dropped.

– the column is enabled to store instances of only one type

How to fix the Error ORA-30751: cannot disable column string from storing objects of type string.string ?

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

Fix the cause of the error and retry the operation.