Cannot delete schemas or virtual objects in Watson Query

You get an error or a message about dependent objects when you try to delete a schema or virtual object in Watson Query.

Symptoms

You might see the following error message when you try to delete a schema or a virtual object in Watson Query.

SQL0672N  Operation DROP not allowed on table "CACHESYS.DVxxxxxxxxxxxxxx"

Or, you might see a message to remove dependent objects when you try to delete a virtual object in Watson Query. The message indicates that a Materialized Query Table (MQT) or cache exists for the virtual object that you are trying to delete. You must delete all active MQTs in the cache dashboard before you can delete the virtual object. For example, you might see a message similar to the following message.

Remove virtual object

DV20220423223832708933 and DV20220426021358834162_B depend on this virtual object. You must remove all dependent objects to delete this object.

Causes

A data cache is associated with the schema or virtual object that you want to delete.

Resolving the problem

To solve this issue, you must delete the cache that is mentioned in the error message before you can delete the schema or virtual objects. To delete the cache, follow these steps.

On the navigation menu, click Data > Data virtualization.
On the service menu, click Virtualization > Cache management.
Click Delete the action menu of the cache.

Note: The Cache management page is available to Watson Query Administrators only. If you do not have this role, contact a Watson Query Administrator. Send error message information and the name of the table that you are trying to delete.