PH57646: MQ Z/OS: THE CHANGES OF SOME ATTRIBUTES OF A SHARED QUEUE NOT REFLECTED TO ITS COPIES. 23/10/19 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The problem in this case is when an attribute is altered which
  is not an attribute which results in a kiss-and-tell being
  sent. In this scenario, other QMGRs are expected to refresh
  their copy of the queue MQSH when processing a DISPLAY QUEUE
  command. APAR PH52830 changed this processing to use the
  in-memory MQSH if there is one which results in the problem.
  *
  Additional information:
  Prior to PH52830, the Db2 look-ups used table CSQ5L930 (used
  by CSQ5ALOB, which is called by CSQ5LIST).
  .
  After this APAR PH57646, when look-ups of non-cached (never
  opened) shared queues are done, they use table CSQ5R930 (used
  by CSQ5AROB, which is called by CSQ5READ).
  .
  After this APAR PH57646, when look-ups of non-cached (never
  opened) shared queues are done for DISPLAY QUEUE commands, they
  use table CSQ5R930.
  
  DISPLAY QUEUE commands correspond with MQCMD_INQUIRE_Q and are
  processed by module CSQM1DQU.
  
  The CSQ5R930 table is used by module CSQ5AROB, which is called
  by module CSQ5READ. The MQ trace entry corresponding with
  CSQ5READ is CSQ5ROBJ.
  

Local fix

• Removing the fix of PH52830
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0 and                 *
  *                 Release 3 Modification 0,                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Following application of APAR PH52830,  *
  *                      changes to shared queue attributes      *
  *                      are not shown on other queue managers   *
  *                      if the queue has never been opened      *
  *                      successfully, or is not currently       *
  *                      open/connected.                         *
  *                      Where the queue is not currently open   *
  *                      any subsequent DISPLAY QUEUE command    *
  *                      will return the correctly updated       *
  *                      attribute values.                       *
  ****************************************************************
  When processing DISPLAY QUEUE, the changes in PH52830 cause the
  currently cached object definition to be used, avoiding
  unnecessary DB2 lookups. In cases where the queue has never been
  opened, or the queue is not currently open/connected in the CF
  recent changes to the queue definition are not always reflected
  in the cached object, leading to out of date values being
  displayed.
  

Problem conclusion

• CSQM1DQU has been changed to refresh the cached view of the
  object after filtering has determined that the object should be
  displayed, so that any recent changes to the object are
  correctly displayed.
  

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:

  UI95083 UI95084

Modules/Macros

• CSQM1DQU CSQMDQUE
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI95084

     UP24/01/18 P F401 {

• R300 PSY UI95083

     UP24/01/18 P F401 {

Fix is available

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