IC90012: IN2JOIN OPTIMIZATION GUIDELINE IS NOT APPLIED TO REWRITE IN PREDICATE TO A JOIN

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • In certain conditions, DB2 does not apply the IN-LIST-to-join
    query
    rewrite when the optimization guideline IN2JOIN is specified.
    
    For example:
    
    In the SQL statement below
    
    SELECT ...
    FROM    PARTS P, SUPPLIERS S, PARTSUPP PS
    WHERE P.PARTKEY = PS.PS_PARTKEY
    AND      S.S_SUPPKEY = PS.PS_SUPPKEY
    AND      P_SIZE IN (?, ?, ?, ...)
    AND      ...
    
    and an optimization guideline
    
    <OPTGUIDELINES><INLIST2JOIN TABLE='P'
    COLUMN='P_SIZE'/></OPTGUIDELINES>
    
    is specified. The statistics information of the table P and the
    columns in the table are not sufficient to indicate that the
    IN-LIST-to-join will outperform other optimization techniques.
    However, when the optimization guideline IN2JOIN is specified,
    DB2 should apply the optimization regardless of the outcome from
    the analysis of the statistics information.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 V9.7 FP9                                      *
    ****************************************************************
    

Problem conclusion

  • Fixed in DB2 V9.7 FP9
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC90012

  • 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

    2013-02-04

  • Closed date

    2013-12-17

  • Last modified date

    2013-12-17

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

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

    IC91788

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP

  • R980 PSN

       UP

  • RA10 PSN

       UP

  • RA50 PSN

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

9.7

Reference #:

IC90012

Modified date:

2013-12-17

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