PH03247: LOOP IN IPI4PROC WHEN FLUSHING TRANSACTIONS FOR HIGH WATER MARK (HWM) PROCESSING

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• HWM processing traverses transaction queues; ignoring the
  currently active transaction. But if there is only a single
  entry on the primary queue it is ignored and we go back to
  attempt storage acquisition again, causing an infinite loop. In
  this case the Dictionary SMB queue held >85% of acquired storage
  and Dictionary queues are not considered during HWM processing,
  only specific transaction queues.
  

Local fix

• Set PA jobs REGION= parameter to 0M (ss REGION=0M) to avoid
  such storage constraints.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IMS Performance Analyzer V4.4       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Loop in IPI4PROC when flushing          *
  *                      transactions for high water mark        *
  *                      processing.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  HWM processing traverses transaction queues; ignoring the
  currently active transaction. But if there is only a single
  entry on the primary queue it is ignored and we go back to
  attempt storage acquisition again, causing an infinite loop.
  In this case the Dictionary SMB queue held >85% of acquired
  storage and Dictionary queues are not considered during HWM
  processing, only specific transaction queues.
  

Problem conclusion

• During HWM processing, storage held by the Dictionary SMB
  queue must also be available for release, if required. As
  the Dictionary queue(s) do not support an ageing process
  the entire queue will be freed. HWM processing will now
  check for a minimum level of transaction queue availability,
  if this threshold is not met then the SMB queue will be
  freed, before driving the standard HWM processing.
  

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:

  UI58874

Modules/Macros

•    IPIIPROC IPISAPAR
  

Fix information

• Fixed component name

  IMS PERF ANALYZ

• Fixed component ID

  5655E1500

Applicable component levels

• R440 PSY UI58874

     UP18/10/06 P F810

Fix is available

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