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

A fix is available

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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 number

    PM51655

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-06

  • Closed date

    2011-11-15

  • Last modified date

    2011-12-09

  • 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

  • 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.

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Document Information

Modified date:
09 December 2011