Preventing bottlenecks

You can avert performance-related problems by regular examination of information that can identify potential problems. Consider performing these tasks as regular intervals:

• Examination of the HCL Workload Automation for Z statistics generated when the STATMSG keyword is defined in the OPCOPTS initialization statement.
• Regular reorganizations of the VSAM clusters: EQQADDS, EQQRDDS, EQQSIDS, and EQQOIDS.
• Monitor IDCAMS LISTCAT output of the VSAM clusters to ensure optimum allocation. Increase the free space allocation if control interval (CI) and control area (CA) splits are frequently occurring. Reallocate the cluster with a large primary allocation if it has extents.
• Review the message log (EQQMLOG) to identify how often and when the CP and JS backups are occurring.
• Educate the user community on how they can avoid long-running dialog requests:
  • Encourage the use of FASTPATH options where available.
  • Use generic search characters only when required. Specify as much information as possible to limit the search.
  • Familiarize users with the key structure of the VSAM clusters. Try to build dialog selection criteria with consideration of the key to prevent sequential searches of the clusters.