Use IXLLSTC REQUEST=MONITOR_KEYRANGE to start or stop keyrange monitoring of a particular list.

This is a new list services function introduced in Release 9 and cannot be invoked on systems running a level of OS/390® lower than Release 9. The service is valid only for keyed list structures allocated in a coupling facility of CFLEVEL=9 or higher.

Keyrange monitoring allows you to determine when a range of keys within a list is empty or not-empty, depending on threshold counts that you have specified. The range of keys and the threshold counts that define the empty and not-empty state are specified with the IXLLSTC WRITE_LCONTROLS service. See Using Threshold Counts when Monitoring a Range of Key Values.