Dump modes

In addition to ADD, other possible dump modes are NODUMP and OVER. The meaning of each mode is:
ADD
When a dump is requested for a dump type that is in ADD mode, the system merges the options specified on the dump request with the options specified in the system dump options list for that dump type. The merged options determine the data areas to dump. If an option specified on the dump request conflicts with an option in the options list, the system uses the option in the options list.
NODUMP
When a dump is requested for a dump type that is in NODUMP mode, the system ignores the request and does not take a dump.
OVER
When a dump is requested for a dump type that is in OVER (override) mode, the system ignores the options specified on the dump request and uses only the options specified in the system dump options list for that dump type combined with the override options to determine the data areas to dump.