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IC74013: FILTER FACTOR OVERESTIMATION WHEN INLIST PREDICATE WITH MULTIPLE PARAMETER MARKERS AND THE COLUMN HAS MANY NULLS

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • We may overestimate the filter factor when we have an INLIST
    predicate with multiple parameter markers/host variables and the
    column has significant number of NULLs.  This can lead to a
    sub-optimal access plan.
    

Local fix

  • Contact DB2 Support
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users running queries with multiple parameter markers with   *
    * an inlist against a table with many nulls                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * We may overestimate the filter factor when we have an INLIST *
    * predicate with multiple parameter markers/host variables and *
    * the column has significant number of NULLs.  This can lead   *
    * to a sub-optimal access plan.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 v9.7 FP5 or newer                             *
    ****************************************************************
    

Problem conclusion

  • Upgrade to DB2 v9.7 FP5 or newer
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC74013

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-01-20

  • Closed date

    2011-12-21

  • Last modified date

    2011-12-21

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

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

    IC74035

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP

  • R970 PSY

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC74013

Modified date: 21 December 2011