Priority Scheduling

  • CICS should have higher priority than the database (MPM).

  • TNS should have higher priority than CICS and MPM.

  • Use the SRM parameter MTTW for MPM regions (before MVS 5). Databases that do the most I/O will get the highest priority.

  • Slow running batch jobs can cause lockouts on OLTP service, increase batch priority or use less concurrent batch.

  • Runaway tasks can be stopped with the RESOURCE LIMITER but it will also kill operations like index creation, etc.