Parallel Test

Once the initial test is working as desired, you can set up a parallel test of the report decollating mission against your production output. Report content often varies from day to day, and you need to ensure that your report decollating mission definitions can process the output consistently. When parallel testing your report decollating missions, you certainly do not want to interfere with any of the production reports. We therefore recommend that you create a duplicate copy of the report for Control-D testing purposes.

There are several methods of doing this. We recommend that you produce a duplicate copy of the targeted reports using the JCL OUTPUT statement. This will create a duplicate copy of the reports onto a different spool class.