PK17356: LOOP OUT OF IPISTMSC AROUND X'180', X'184', X'18A' AND X'18E'

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Loop in IPISTMSC when a large number of incomplete MSC
  transactions causes the MSC queue VS limit to be reached.  The
  synonym chain is not cleared correctly and invalid
  links can cause problems, including program loops.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IMS Performance Analyzer V3R3.  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Loop in IPISTMSC when a large number    *
  *                      of incomplete MSC transactions causes   *
  *                      the MSC queue VS limit to be reached.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Loop in IPISTMSC when a large number of incomplete MSC
  transactions causes the MSC queue VS limit to be reached.
  The synonym chain is not cleared correctly and invalid
  links can cause problems, including program loops.
  

Problem conclusion

• Correctly handle synonym forward/backward chaining when
  transactions are flushed in routine IPISTMSC.
  VS handling for IMSPA Transit Reporting is inflexible
  in the way it allocates storage between various report
  queues.
  Finite limits are set without regard to overall VS
  availability and may cause incomplete data to be flushed
  prematurely.
  Allow more flexibility in VS handling by setting upper
  and lower bounds for certain Transit Report queues,
  which may be impacted by Transit Options selected or the
  mix of transactions being processed.
  

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:

  UK11933

Modules/Macros

• IPIPET71 IPIPET81 IPIPET91 IPIPE271 IPIPE281
  IPIPE291 IPIPRS71 IPIPRS81 IPIPRS91 IPIPRT71 IPIPRT81 IPIPRT91
  IPIPR271 IPIPR281 IPIPR291 IPISLOGD IPISTMQ
  

Fix information

• Fixed component name

  IMS PERF ANALYZ

• Fixed component ID

  5655E1500

Applicable component levels

• R330 PSY UK11933

     UP06/02/22 P F602

Fix is available

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