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

A fix is available

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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 number

    PH09655

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-03-14

  • Closed date

    2019-05-13

  • Last modified date

    2019-08-05

  • 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

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
05 August 2019