When Multiple Calls to Cleanup Unused May Be Required

When Multiple Calls to CLEANUP UNUSED May Be Required

Usually turning the "iterative" switch on will identify all items that are to be removed in a single operation, but if a large number of different item types are to be removed it may require multiple clean-ups to remove absolutely everything unwanted from a model.

The reason is that in iterative cleanup mode PRIMER has to ask the question "if I remove this then can I remove that?" to many levels of complexity, and if a lot of different entity types are removed there comes a stage at which this gets too difficult to resolve in a single operation.

Therefore if a long list of different item types is identified for removal it is usually worth repeating the CLEANUP UNUSED operation until the message " No items found to delete " is returned. This guarantees that no further unwanted items remain.