Shutting down IMS

The command that is used to shut down the control region also forces termination of data communications and the dependent regions if they have not already been terminated in an orderly way, and can also tell the CQS subsystem to shut down.

A common sequence for shutting down the entire online system is:

1. For an IMS DB/DC or DCCTL environment, stop data communications. For an IMS DBCTL environment, disconnect from the CCTL.
2. Stop dependent regions.
3. If dynamic resource definition (DRD) is enabled and AUTOEXPORT is not, export any modified runtime resource and descriptor definitions that have not yet been exported.
4. Stop the control region.
5. For an IMS DB/DC or DBCTL environment, stop the IRLM.
6. For a shared-queues environment, if CQS has not shut down, shut it down.
7. For an IMSplex system using CSL, shut down the CSL manager address spaces (OM, RM, and SCI).