Specifying IMS execution parameters

You can specify control region execution parameters in the appropriate control region JCL, or in the IMS, DBC, and DCC members of the IMS PROCLIB data set. Parameters specified in these members override any system definition. The parameters are not positional.

Use the PARM1= and PARM2= parameters on the EXEC statements for the control region to specify the JCL for IMS online execution.

Recommendation: For optimal performance, use the PARM1= and PARM2= parameters rather than creating your own JCL. These parameters are specified symbolically for the control region.