IBM Support

IC67110: OPTIMIZER CHOOSES BAD EXECUTION PLAN WHEN FILTER MATCHES A HIGH NUMBER OF ROWS

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APAR status

  • Closed as program error.

Error description

  • The optimizer chooses a bad execution plan when a filter matches
    a high number of rows causing the query to run slow. The
    estimated number of rows is also incorrectly calculated.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Unique columns lacking statistics                            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * Join selectivity was not calculated correctly when unique    *
    * columns lack statistics.                                     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to 11.50xC7 when available.                          *
    ****************************************************************
    

Problem conclusion

  • Fixed in 11.50xC7.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC67110

  • Reported component name

    IBM IDS ENTRP E

  • Reported component ID

    5724L2304

  • Reported release

    B15

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-03-10

  • Closed date

    2010-11-17

  • Last modified date

    2010-11-17

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

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

Fix information

  • Fixed component name

    IBM IDS ENTRP E

  • Fixed component ID

    5724L2304

Applicable component levels

  • RB15 PSN

       UP

  • RB15 PSY

       UP

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Document Information

Modified date:
17 November 2010