Tuning for performance in a shared-queues environment

The structures and parameters you define for a shared-queues environment determine how the system performs.

To optimize system performance, try adjusting the following structures and parameters:

  • The size of the IMS execution parameters:
    • LGMSGSZ=
    • QBUF=
    • QBUFHITH=
    • QBUFLWTH=
    • QBUFMAX=
    • QBUFPCTX=
    • QBUFSZ=
    • SHMSGSZ=
  • The value of the CQS local structure definition parameter SYSCHKPT=
  • The values of the CQS global structure definition parameters:
    • OVFLWMAX=
    • STRMIN=
  • The size of the shared-queues structures on the coupling facility
  • The size of the z/OS® system log structure on the coupling facility
  • The number of z/OS system log data sets that back up the z/OS system log structure
  • The frequency of structure checkpoints