PH33375: CICS REGION FLOODED WITH CESC TRANSACTIONS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An increase in transaction response time occurred in a CICS
  regions. A dump showed the region was being flooded with CESC
  transactions. There were numerous ICEs scheduled for this
  transaction and they all had ICERQID, the request
  identification, set to DFHCESC.
  A similar problem was fixed at subsequent releases of CICS
  by APAR PH03982.
  
  Additional Symptom(s) Search Keyword(s): KIXREVSVR
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: The ICE chain contains many ICEs with   *
  *                      REQID=DFHCESC and the CICS region       *
  *                      is periodically flooded with CESC       *
  *                      transactions being attached.            *
  ****************************************************************
  A CICS region was COLD started. After observing an increase
  in transaction response time a dump was taken. This showed
  numerous ICEs on the ICE chain with REQID=DFHCESC whereas there
  should be no more than one of these at any time.
  
  APAR PH03982 resolved a similar problem that occurred on a WARM
  start. As with that reported problem, the issue is caused by a
  failure by DFHSNSC to cancel an existing CESC ICE before
  rescheduling CESC by adding a new ICE.
  

Problem conclusion

• This fix contains 2 parts:
  1. CICS is changed so that ICEs for transaction CESC are not
  restored over a WARM restart.
  2. When scheduling CESC in DFHSNSC a DFHIC TYPE=CANCEL is now
  always attempted for a REQID=DFHCESC ICE.
  A response that the ICE was not found is treated as acceptable.
  This part of the fix applies regardless of the CICS start type.
  

Temporary fix

Comments

APAR Information

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

  PH03982

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

  UI73776

Modules/Macros

• DFHICRC  DFHSNSC
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI73776

     UP21/02/05 P F102

Fix is available

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