A fix is available
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
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