Is it possible to configure Enterprise Server so that when your region starts a CICS transaction called JCL1 runs automatically to delete old spool files?

Yes, you can configure your Enterprise Server so when your region starts a CICS transaction called JCL1 runs automatically to delete old spool files. You can configure how often this happens and how long spool files are kept. But the documentation available to set this up can be a bit daunting for JCL users with limited experience with CICS systems. The document attached to this article will help to make it more straight forward.

Note:
The Spooler Housekeeping tool (DFHZJCL2, DFHZJCL3) is now available on Windows platforms and UNIX platforms, and from Server Express 5.0 WS4.