IMS stage 1 system definition

Stage 1 of IMS system definition takes the IMS macros that you coded and assembles them into Stage 2 JCL.

Stage 1 of the system definition process uses the z/OS® High Level Assembler program and uses the IMS macros as input. Other references are to the IMS distribution macro libraries (IMS.ADFSMAC).

The output from stage 1 of the IMS system definition process includes:

• Standard assembler listing output with any appropriate error messages.
• Stage 2 system definition input JCL, which is also used for the JCLIN process.

Depending on what is specified in the IMSGEN macro for stage 1, stage 2 of the system definition process can be divided up into a single job with multiple steps, or into many jobs with fewer steps.

You specify the assembler and binder data sets and options, and the system definition output options and features in the IMSGEN macro.

Figure 1. Stage 1 and Stage 2 of the system definition process