PM26918: DFHDB2037 FOLLOWED BY DFHAP0001 AN ABEND (CODE 04F/AKEX) IN DFHD2CO

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS doesn't automatically reconnect to DB2 when, while CICS
  remains up, DB2 is brought down, then brought back up but is
  canceled before it is finished initializing, and then it is
  brought back up again.
  Your DB2 connection is defined with STANDBYMODE(RECONNECT) so
  there are a number of 04E/AKEX in the kernel error table, but
  the final failure is for 04F/AKEX.
  
  Additional Symptom(s) Search Keyword(s): AP0001, DFHAP0002,
  DFHD2STR, code X'31D7', STOP DB2 MODE(FORCE)  DSNAPRH
  KIXREVGJT
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Transaction Server for z/OS users   *
  *                 using DB2.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: The CICS DB2 connection may be left in  *
  *                      a state of disconnect when using        *
  *                      STANDBY=RECONNECT.                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The CICS DB2 connection remains in a state of disconnect
  following an ABEND 04F from DB2.  This is because CICS
  determines that it is disconnected from DB2 although DB2 has
  already identified itself to CICS.  When DB2 is restarted, the
  CICS DB2 connection is not re-established and remains
  disconnected.
  

Problem conclusion

• The DB2 coordinator DFHD2CO has been modified to be able to
  determine the state of the CICS-DB2 connection after CICS
  receives a 04F ABEND from DB2.  CICS will disconnect from DB2
  if it had identified with DB2 although the connection was not
  fully established.  This places the CICS-DB2 connection into a
  state of standby waiting for DB2 to be restarted.
  
  In publication GC34-7015-02, CICS Transaction Server for z/OS
  Version 4 Release 1 Supplementary Data Areas
  -> D2GLB CICS/DB2 Global Block
  --> Table 48 continuation on page 107
  
  GLB_MSB_PARM2 offset FA will have a new bit setting of:
  .1.. .... GLB_DB2_IDENTIFY_ATTEMPTED
                DB2 Identify Attempted
  

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:

  UK63908

Modules/Macros

•    DESD2CO  DFHD2CO  DFHD2GLC DFHD2GLD
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK63908

     UP11/01/19 P F101

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.