XRF considerations for IMS change list processing

The IMS change list is created for an XRF alternate IMS during the IMPORT DEFN SOURCE(REPO) SCOPE(ALL) command if the resource definition is defined for the XRF alternate system.

When the XRF alternate is in restart mode, it is considered inactive. The IMS change list that is created for the XRF alternate is deleted during takeover without being processed, because the resource definitions are created or updated on the alternate from the log records that are sent from the IMS active system.

If one exists, the IMS change list for the IMS active system is processed during the restart of the IMS active system, and the X'22' log record that was written during the internal import is processed on the XRF alternate to obtain the resource definitions. The IMS change list is ignored and deleted during takeover.

The IMS change list for the XRF alternate is not reprocessed at IMS takeover because all the information in the change list is already processed as a part of the X'22' log record and the checkpoint log records. The IMS change list for the XRF alternate is deleted at the end of takeover.