The INITIMS parameter controls the activation of the IOF. The default of the INITIMS parameter is NO. If your data center is an IMS/DB-only shop, leave INITIMS set to NO to prevent IMS SVC recognition problems at startup.
Only those customers who have licensed the IOF can set the INITIMS parameter to YES, and they can do so only at product initialization. If you are a customer who has licensed the IOF but you have z/OS images on which IMS is never used, you can gain a CPU and storage performance advantage by setting the parameter to NO on those systems.
When the value of INITIMS is NO, the OPSPARM/OPSPRM SHOW(ALL) command processor does not include IMS parameters in its output. Setting INITIMS to NO also inhibits the display of IMS parameters in OPSVIEW option 4.1.1. This characteristic is by design and was implemented to reduce storage and improve performance. If INITIMS is set to YES, IMS parameters appear in the OPSPRM OPS/REXX function output, the OPSPARM command processor output, and the OPSVIEW option 4.1.1 displays.
By accessing the CA OPS/MVS Identify IMS function (OPSVIEW option 7.4), you can create the parameter cards necessary for the IMS Operation Facility. A batch version of this function resides in member BATCHPRM of the SAMPLES library.
Note: For information about OPSVIEW, see the OPSVIEW User Guide.
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