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IT38833: DB2 QUERY PLAN DOES NOT CHOOSE INDEX WHEN IN PREDICATE HAS PARAMETER MARKER.

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APAR status

  • Closed as program error.

Error description

  • Db2 query plan may not choose index and show poor performance
    when the following conditions are met:
    - There is an IN predicate as subterm of OR
    - The other subterm of OR has IS NULL predicate 
    - IS NULL predicate is on parameter marker
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * all                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to 11.5 FP7 or later                                 *
    ****************************************************************
    

Problem conclusion

  • Upgrade to 11.5 FP7 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT38833

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B50

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-10-27

  • Closed date

    2021-11-22

  • Last modified date

    2021-11-22

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

    IT35802

  • 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

  • RB50 PSN

       UP

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.5","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
17 December 2021