CCTL thread failure

A CCTL thread failure can occur if the CCTL thread makes a database resource adapter (DRA) request, and IMS ends abnormally during that request.

When this happens, IMS issues a DFS554I message, and the CCTL indicates the failure to its operator. The program is stopped; you can start it again using the /START command after the problem is resolved. If a CCTL thread fails within the CCTL itself, IMS takes no action.

A thread can also fail because of an abend while the thread is within IMS or the DRA. For example, when the IMS DBCTL system fails, all CCTL threads ends abnormally in the DRA with a U002 abend. What happens to the UOR associated with the CCTL thread is determined by its sync-point state. If the failure occurs while UOR is in-flight, IMS backs the UOR out; if the UOR is in-doubt (in the middle of the sync-point process), the UOR remains in-doubt.