IT13006: Accounting or statistics AverageQueueTime displays incorrect large values

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 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