Deleting an access list entry for a hiperspace

Access lists have a limited size; the DU-AL has up to 509 entries and the PASN-AL has up to 510 entries. Therefore, it is a good programming practice to delete entries from an access list when the entries are no longer needed. The specific rules are:

If a program needs an entry for a short period of time, it should delete the entry when it no longer needs the entry.
If a program adds an entry and uses that entry during execution, the program does not need to delete the entry; the system deletes the entry when the task terminates.
Once the entry is deleted, the system can immediately reuse the ALET.

Use ALESERV DELETE to delete an entry on an access list. The ALET parameter identifies the specific entry.

Programs that share hiperspaces with other programs have another action to take when they delete an entry from an access list. They should notify the other programs that the entry is no longer connecting the ALET to the hiperspace. Otherwise, those programs might continue to use an ALET for the deleted entry. See ALET reuse by the system for more information.