PI98789: CEMT INQUIRE UOWENQ CAN USE EXCESSIVE CPU AND DISPLAY NCORRECTLY WHEN ISSUED FROM THE CONSOLE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You issue the following modify command to a CICS region:
  CEMT INQUIRE UOWENQ
  and find it can use an excessive amount of
  CPU- over 2 minutes in some cases.
  Then it has some missing output.  Here is an example of that:
  --------------------------------------------------------------
  18.30.00 STCJOB1  +   077
  
     077     Enq Uow(UOW00029) Tra(AAAA) Tas(0000029)
     077     Exe Own Dur(00321131) Res(AAAARES)
     077     Enq Uow(UOW00028) Tra(BBBB) Tas(0000028)
     077     Exe Own Dur(00321131) Res(BBBBRES)
     077     Enq Uow(UOW11111) Tra(CSMI) Tas(0011111)
     077     Dat Own Dur(00000000) Res(aaaa.bbbbb.ccccccc.ddddd)
     077     Enq
     077     Enq
  18.30.00 STCJOB1  +   078
     078     Enq
     078     Enq
     078     Enq Uow(UOW11111) Tra(CSMI) Tas(0011111)
     078     Dat Own Dur(00000000) Res(aaaa.bbbbb.ccccccc.ddddd)
     078     Enq Uow(UOW11111) Tra(CSMI) Tas(0011111)
     078     Dat Own Dur(00000000) Res(aaaa.bbbbb.ccccccc.ddddd)
  ..
  18:30:05 STCJOB1  +   234
     234     Enq
     234     Enq
  ..
  18:30:15 STCJOB1  +   621
     621     Enq
     621     Enq
  --------------------------------------------------------------
  
  Notice the Enq entries above, without any further output
  associated with it... that is incorrect.
  This occurs when  CEMT INQUIRE UOWENQ is issued, and a UOW owns
  over 33,0000 ENQ's.
  
  
  
  Additional Symptom(s) Search Keyword(s): KIXREVxxx
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: CEMT I ENQ issued from a console may    *
  *                      cause a CICS performance degradation.   *
  ****************************************************************
  In the reported problem, tens of thousands of ENQ's
  were linked to a UOW.  A CEMT I ENQ command was issued
  via the console by an automated product at regular
  intervals.
  .
  As CEMT code browsed the thousands of ENQ's in the
  system it compromised QR TCB availability preventing
  other work from running in a timely fashion.
  

Problem conclusion

• DFHEMT56 has been modified and will cap the number
  of INQUIRE ENQ's it can perform when the command
  originates at a console.  If the cap ( 1000 ENQ's ) is
  exceeded then a "Too Many Elements" error message is
  written to the console.
  

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:

  UI57578 UI57579 UI57580 UI57581

Modules/Macros

• DFHEMT56
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI57581

     UP18/08/01 P F807

• R100 PSY UI57580

     UP18/08/01 P F807

• R800 PSY UI57578

     UP18/08/11 P F808

• R900 PSY UI57579

     UP18/08/03 P F808

Fix is available

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