Fixes are available
APAR status
Closed as program error.
Error description
If the XQMSGSA attribute of the channel status of a cluster sender channel is queried at a time when SYSTEM.CLUSTER.TRANSMIT.QUEUE is deep then the performance of the queue manager as a whole can suffer considerably. ADDITIONAL KEYWORDS: Poor performance CLUSSDR XMITQ backed up backup curdepth high S.C.T.Q. InquireChannelStatus
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Users with deep SYSTEM.CLUSTER.TRANSMIT.QUEUE who are inquiring upon the number of messages available to each individual cluster sender channel. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: If the XQMSGSA(available message count for this channel) attribute of a cluster sender is queried then the queue manager has to iterate through the messages on SYSTEM.CLUSTER. TRANSMIT.QUEUE (SCTQ). In order to determine which messages are destined for this cluster sender, the queue manager needs to look up the full CorrelId for each message whose CorrelId hash value matches. If there are a lot of messages for the queried channel then there will be a lot of CorrelId's to look up on disk which can make this function very slow.
Problem conclusion
If more than 999 messages are available on SYSTEM.CLUSTER.TRANSMIT.QUEUE for any particular destination then the value 999 will be returned to any inquiry upon XQMSGSA for the associated channel status. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v6.0 Platform Fix Pack 6.0.2.3 -------- -------------------- Windows U200279 AIX U811346 HP-UX (PA-RISC) U811630 HP-UX (Itanium) U811631 Solaris (SPARC) U811632 Solaris (x86-64) U811633 iSeries SI27288 Linux (x86) U811634 Linux (x86-64) U811635 Linux (zSeries) U811636 Linux (Power) U811637 Linux (s390x) U811638 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available, information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IZ01835
Reported component name
WMQ LIN X86 V6
Reported component ID
5724H7204
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2007-07-24
Closed date
2007-07-30
Last modified date
2007-09-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WMQ LIN X86 V6
Fixed component ID
5724H7204
Applicable component levels
R600 PSY
UP
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Document Information
Modified date:
31 March 2023