DRD command performance considerations

Deleting database resource definitions by using DRD commands incurs a performance overhead of reading the intent lists from the ACBLIB for all application program whose intent lists are not loaded.

The overhead reading the intents list is necessary to determine which transactions need to stop queuing to prevent work that might cause commit to fail. This performance overhead is proportional to the number of application programs defined for which the intent list is not loaded.

Checkpoints cannot run in parallel with any DRD command because the DRD command can change resource attributes and relationships. Checkpoints must include a clean copy of the resource definitions, which means that the resources were not changed during the checkpoint.