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IT05940: POTENTIAL CORRUPTION DURING READAHEAD DATA PREFETCHING WHEN A DECIMAL KEY PART IS USED WITH INDEX COMPRESSION

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The symptoms that a customer would most likely see are incorrect
    results from an index only scan, a keydata mismatch error from
    an iscan fetch, a key not found during an update or delete
    operation, or duplicates allowed to be inserted into the table.
    The corruption that could cause these symptoms could occur
    while doing read ahead prefetching of data pages from an index
    scan and prefix compression is in affect for the index and index
    has a decimal key part.
    
    The corrupted byte will originally have a value of 0x00 and
    incorrectly have be changed to 0x0C. The INSPECT command, when
    run with the INDEXDATA option, will detect such corruption.
    

Local fix

  • Rebuild the corrupt index using the REORG INDEX(ES) command.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of index compression                                   *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 version 10.1.0.5.                             *
    ****************************************************************
    

Problem conclusion

  • The problem is first fixed in DB2 version 10.1.0.5.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT05940

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-12-04

  • Closed date

    2015-07-10

  • Last modified date

    2015-07-10

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

    IT05068

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

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RA10 PSN

       UP

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"10.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
10 July 2015