PM83896: CICS STARTUP TIME TAKES LONGER BY THE LARGE DFHSHUNT. UOWS ARE WAITING FOR A FORGET FLOW FROM THE FRONTEND REGION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer use LU61 connection between CICS.
  After DFHRM0107, UOWs are retained to wait the forget flow.
  DFHRM0107 INTERSYSTEM COMMUNICATION  FAILURE.
            RESOURCE UPDATES MAY BE OUT OF SYNC.
  Customer get start up delay for the specific CICS becasue old
  UOWs retained for a long time.
  These UOWs retained until INITIAL start of CICS.
  (COLD start, CEMT SET UOW FORCE does not work.)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS warm or emergency start takes a    *
  *                      long time due to a large number of UOWs *
  *                      waiting to be recovered.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  User has a pair of DTP transaction that communicate over an
  LU61 connection. But the backend transaction is not defined and
  DFHZEMW is called by DFHACP to send error message return to
  frontend. Then DFHZEMW sets abort completion flag the LU61
  TCTTE and returns to DFHACP. But during task termination
  process, recovery manager invokes DFHCR1U to perform the
  processing for LU61 sessions backing out task-termination
  syncpoint. DFHZEMW is invoked again and it detects error
  message has already been sent but returned with a return
  code x'0C' in the TCA field TCATPAPR. This directly leads
  DFHCR1U set wrong rmlk flags. Thus, old UOW not deleted and
  also cause the UOW to wait for a FORGET flow from the frontend
  region.
  
  Keyword: msgDFHRM0107
  

Problem conclusion

• DFHZEMW has been changed to return a value of x'00' in field
  TCATPAPR when it detects that an ABORT processing has already
  completed or that an ABORT has already been sent.
  

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:

  PM85383 UK93765 UK93764

Modules/Macros

•    DFHZEMW
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK93764

     UP13/05/02 P F305

• R700 PSY UK93765

     UP13/05/02 P F305

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.