IBM Support

IT13006: Accounting or statistics AverageQueueTime displays incorrect large values

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • In a system using NTP synchronization, amqsmon can occasionally
    display a large positive for AverageQueueTime when accounting or
    statistics
    is generated.
    
    Example:
    
    AverageQueueTime: [174025887487825958, 0]
    Other affected attributes:
    
    TimeOnQAvg
    TimeOnQMax
    TimeOnQMin
    
    This problem likely to occur when there is a backward time shift
     in the system time because of NTP synchronization.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using accounting and statistics will be affected by this
    problem.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The AverageQueueTime is calculated from  QTimeTotal value set by
    the
    queue manager. When there is a backward time shift then
    QTimeTotal
    is set to maximum value for the datatype. However the
    AverageQueueTime
    did not follow this rule and the average was calculated from the
    max value set.
    

Problem conclusion

  • MQ accounting and statistics code has been modified to set the
    AverageQueueTime to Maximum
    if there is a negative time shift.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.6
    v9.0 CD    9.0.1
    v9.0 LTS   9.0.0.1
    
    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

    IT13006

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-04

  • Closed date

    2016-08-25

  • Last modified date

    2017-09-13

  • 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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
13 September 2017