With your dynamic unallocation request, you can include text units to change a data set's or z/OS® UNIX file's parameters as it is being deallocated. If your request is in the form of verb code 02, key 8, the changes are honored when the data set or z/OS UNIX file is actually released, unless they have been overridden in the meantime. If your dynamic unallocation request is in the form of verb code 02, key 7, the changes take effect immediately.
You cannot delete members of partitioned data sets with a disposition of DELETE; the system deletes the entire data set. An overriding disposition of DELETE for data sets allocated as shared is not valid; the system fails the overriding disposition request.