Reuse of DO IDs

The DO ID for a shareable derived object is guaranteed to be unique within the VOB, for all views.

That is, if you delete a shareable DO, its numeric file name extension is not reused (unless you reformat the VOB that contains it).

The DO ID for a DO created by an express build (a nonshareable derived object) is unique only at a certain point in time. If you delete a nonshareable DO, the DevOps Code ClearCase® build tools can reuse its numeric file name extension. (Because ClearCase tracks derived objects using their VOB database identifiers, no build confusion occurs if a file name extension is reused.)

DO IDs change when any of these events occur:

The configuration record reflects these DO-ID changes.