PI19431: TRANSACTION DUMP CONSTANTLY BEING TAKEN BUT IT NEVER FINISHES. THIS IS A YIELDING LOOP . SET DUMPDS SWITCHNEXT AUTOMATED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ERROR DESCRIPTION:
  CICS is taking a large transaction dump that will not fit in a
  whole DFHDMPA or DFHDMPB .  And when the active datset (DFHDMPA
  or DFHDMPB) fills up, CICS switches to the other dataset.
  Andafter every switch, there is automation that issues an EXEC
  CICS SET DUMPDS SWITCHNEXT so that CICS always switches to the
  other dataset when the active fills up.
  .
  This situation leads to the following messages being issued
  repeatedly:
  .
  00.17.13 STC04535  IEC030I
  B37-04,IFG0554A,PRDCICS,PRDCICS,DFHDMPA,714B,PRD001,SYS3.CICST
  S42.PRDZ.DFHDMPA
  00.17.13 STC04535  +DFHDU0303I PRDCICS Transaction Dump Data
  set DFHDMPA closed.
  00.17.13 STC04535  +DFHDU0304I PRDCICS Transaction Dump Data
  set DFHDMPB opened.
  .
  00.17.35 STC04535  IEC030I
  B37-04,IFG0554A,PRDCICS,PRDCICS,DFHDMPB,7110,PRD002,SYS3.CICST
  S42.PRDZ.DFHDMPB
  00.17.35 STC04535  +DFHDU0303I PRDCICS Transaction Dump Data
  set DFHDMPB closed.
  00.17.35 STC04535  +DFHDU0304I PRDCICS Transaction Dump Data
  set DFHDMPA opened.
  00.17.35 STC04535  +DFHDU0305I PRDCICS Transaction Dump Data
  set switched to DFHDMPA
  .
  What is going on is that when a transaction dump dataset fills
  up while a transaction dump is in progress, CICS restarts the
  transaction dump from the beginning after switching to the
  other dump dataset.  If that transaction dump doesn't even fit
  in a whole dump dataset then CICS will switch to the other and
  start the transaction dump again.  This goes on and on forever
  if there is automation to consantly reset the DUMPDS to
  SWITCHNEXT after each switch.
  
  Additional Symptom(s) Search Keyword(s): KIXREVDWZ
  

Local fix

• Allocate large transaction dump datasets
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Transaction looping when performing a   *
  *                      transaction dump due to AUTOSWITCH      *
  *                      being reset.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A transaction has used a number of large containers and
  attempts to take a transaction dump.  If the dump datasets are
  too small and AUTOSWITCH is enabled, CICS disables AUTOSWITCH
  and switches to use the alternate dump dataset.
  
  If automation is used to reenable AUTOSWITCH for dump datasets
  then it is possible for the transction to loop forever because
  of the resetting of AUTOSWITCH.
  

Problem conclusion

• DFHDUXD has been changed so that it will only attempt to dump
  twice, ignoring AUTOSWITCH the second time.
  
  DFHDEFDS has been updated to change DUMP A and DUMP B datasets
  to be created with 25 cylinders.
  
  CICS Transaction Server for z/OS Version 4 Release 2 System
  Definition Guide, SC34-7185-01 has been altered.  The sample
  job control statements within "Defining the transaction dump
  sets" have had the cyclinder sizes changed to being (CYL,(25)).
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PI22816 UI21080

Modules/Macros

•    DFHDEFDS DFHDUXD
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R700 PSY UI21080

     UP14/09/12 P F409

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.