PM82763: ABEND04E 00C90101 IN DSNODAL1 ERQUAL5002 SINCE THE LOB MAP PAGE RETURNED AFTER I/O IS ALL ZEROS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After a LOAD Utility successfully completed, ABEND 04E
  RC00C90101 in DSNODAL1 5002 was seen, since a subsequent I/O
  for a LOB MAP PAGE returned a page with all zeros.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 users.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND04E 00C90101 ERQUAL5002 in         *
  *                      DSNODAL1 when accessing a LOB space     *
  *                      after a LOAD utility has been run.      *
  *                                                              *
  *                      ABEND04E RC00C200A4 in DSNB5COM during  *
  *                      a LOAD, followed by DB2 subsystem       *
  *                      termination RC00E50702.                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a LOAD utility is updating multiple LOG NO LOB spaces,
  there is a timing window in which DB2 may schedule a second
  write engine for a LOB while one is already running.  Since the
  LOB is opened in format-write mode, the concurrent running of
  multiple write engines can result in previously formatted pages
  being written over with zeroes, which can cause a subsequent
  ABEND04E RC00C90101 in DSNODAL1.  It may also result in a write
  I/O failure which causes an ABEND04E RC00C200A4 in DSNB5COM,
  bringing down DB2.
  

Problem conclusion

• The logic which drives writes for LOG NO LOBs has been modified
  to ensure that a second write engine will not be scheduled if
  the LOB is being accessed in format-write mode.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UK92490

Modules/Macros

•    DSNB1FLW
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK92490

     UP13/03/28 P F303

Fix is available

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