Region controller failures

One symptom of a dependent region failure is an increase in the number of transactions on the message queue. If the region appears to be looping, stop the region with the /STOP REGION ABDUMP command. If the region does not stop, enter the /STOP REGION CANCEL command.

You can monitor the status of your regions with the /DISPLAY ACTIVE, /DISPLAY Q TRANSACTION, and /DISPLAY Q BALGRP commands.

z/OS® issues messages IEF450I and IEF404I to indicate an abend in a BMP, MPP, or IFP region. If these messages are not followed by a DFS554I message, issue the /STOP REGION ABDUMP command so that IMS recognizes that the region has terminated and backs out any database updates.

After you determine and correct the problem that caused the region to loop or that caused the abend, use the /START command to start the transaction and application program again.