Preventing Job logs:

To prevent a job log from being produced at the completion of a batch job, you can specify *NOLIST for the message level text of the LOG parameter on the
Batch Job (BCHJOB),
Submit Job (SBMJOB),
Change Job (CHGJOB),
Create Job Description (CRTJOBD), or
Change Job Description (CHGJOBD) command.

If you specify *NOLIST for the message text value of the LOG parameter, the job log is not produced at the end of a job unless the job end code is 20 or greater. If the job end is 20 or greater, the job log is produced. For an interactive job, the value specified for the LOG parameter on the SIGNOFF command takes precedence over the LOG parameter value specified for the job.