CCTL region failure

If a CCTL fails, it normally disconnects from the IMS DBCTL system and has no effect on the IMS DBCTL system itself. The CCTL threads are terminated immediately or after they complete their current DBCTL request. These thread terminations appear as DFS554I messages. The programs are not stopped.

What action IMS takes for database changes made (units of recovery), depend on the sync-point state of the thread. If a CCTL fails, a U113 abend of the DBCTL control region can occur.