PM51655: VARIOUS DATA INCONSISTENCIES WITH DATA SHARING AT V10 SINCE SOME GBP DEPENDENT PAGES WERE NOT CASTOUT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Various data inconsistencies ABEND 04E 00C90101 00C90102
  00C90105 or 00C902xx type abends due to page regression as
  pages were not CASTOUT. Also, after fallback to V9, data
  inconsistencies were found and ABEND04E in DSNIONX2
  ERQUAL5005 type dumps seen. A subsequent review of the DB2 V10
  archive logs showed objects that were GBP-dep in V10 had pages
  not CASTOUT before they became non-GBP-dep. The Customer then
  did a fallback to V9, where the DSNIONX2 5005 abends were seen
  with broken objects found - missing data.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 data sharing users.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Page regression and corrupted data      *
  *                      may cause                               *
  *                      - Incorrect output, INCORROUT.          *
  *                      - ABEND04E RC00C90101, RC00C90102,      *
  *                        RC00C90105, or RC00C902xx in          *
  *                        various CSECTS.                       *
  *                      - Data/index inconsistencies reported   *
  *                        by the CHECK INDEX utility.           *
  *                      - Page regression reported by the       *
  *                        DSN1LOGP utility.                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A new restart token algorithm may produce an incomplete list
  of pages cached in a group buffer pool (GBP). The castout
  procedure using this list may fail to write out all updated
  pages in a GBP. If those pages are purged after castout, the
  updates will be lost.
  

Problem conclusion

• The castout logic has been modified to not use the new restart
  token algorithm.
  

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:

  UK73864

Modules/Macros

• DSNB5BPL
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK73864

     UP11/11/30 P F111

Fix is available

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