PH09655: MQ V9 Z/OS PERFORMANCE ISSUE WHEN GETTING MESSAGE FROM SHARED QUEUE VIA CICS-MQ BRIDGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ V9
  .
  Performance issue when getting by CorrelId from deep shared
  shared queue.
  .
  Additional Information:   The PTF for this APAR updates queue
  manager code that is part of load module CSQELPLM, located in
  SCSQAUTH. Although SCSQAUTH is in both the CICS region STEPLIB
  and the MQ started task, this particular module is only used by
  the MQ queue manager started task.
  .
  Each queue manager that you want to apply the code change to
  must be restarted. Other queue managers in the QSG need not be
  restarted but they will see no performance benefit if not
  restarted. No CICS regions need to be restarted.
  

Local fix

• na
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Getting messages from a shared queue    *
  *                      via the MQ CICS Bridge is done          *
  *                      inefficiently for deep queues.          *
  ****************************************************************
  When the MQ CICS Bridge gets messages from a shared queue an
  inefficient algorithm is used. This results in performance
  degradation when the CICS Bridge is getting from a shared queue
  that has a lot of messages that match the correlation id of the
  CICS bridge.
  

Problem conclusion

• The algorithm used to get messages from a shared queue for the
  MQ CICS Bridge has been changed so that performance is no longer
  impacted when there are many messages on the shared queue with
  matching correlation ids.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI62968 UI62969

Modules/Macros

• CSQEMGEF
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI62968

     UP19/06/06 P F906

• R100 PSY UI62969

     UP19/06/06 P F906

Fix is available

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