APAR status
Closed as program error.
Error description
Running WMQ v8 and processing long running transactions with a small number of primary log extents can lead to significant performance impacts while the queue manager formats its secondary log extents.
Local fix
Extending the number of primary logfiles can help to workaround the performance impact.
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of MQ version 8 who are using transactions, and have configured a small number of primary log extents. This issue is more likely to be prevalent if the system also maintains long-running transactions. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: When the queue manager detects that primary log extents are approaching capacity, it is expected that the queue manager will delay lower priority log writes until more space is available. A logic error meant that the queue manager incorrectly detected the log full condition and applied this throttling to log updates, even though sufficient space was available. This lead to delays in processing.
Problem conclusion
The queue manager logic has been updated to prevent this erroneous detection of a log full condition. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.4 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
IT09502
Reported component name
WMQ BASE MULTIP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-06-18
Closed date
2015-08-20
Last modified date
2015-08-20
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 BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
20 August 2015