PM81295: CHOOSE BAD INDEX ACCESSING DUE TO CALCULATE PAGE LIST COST

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • N/A
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: For all DB2 10 for z/OS users who have       *
    *                 queries choosing range list access           *
    *                 (ACCESSTYPE='NR' in PLAN_TABLE output).      *
    ****************************************************************
    * PROBLEM DESCRIPTION: PM81295 corrects a problem related      *
    *                      to range-list access (ACCESSTYPE='NR'   *
    *                      in PLAN_TABLE output) that a range-list *
    *                      plan may not have the lowest cost of    *
    *                      any plan it beats.                      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    PM81295 corrects a problem related to range-list access that a
    range-list plan may not be assigned the lowest cost of any plan
    it beats.  As a result, the query could have poor performance.
    
    
    Additional Keywords:
    SQLRANGELIST RANGELIST SQLOR SQLACCESSPATH
    

Problem conclusion

  • The logic in the DB2 optimizer has been corrected to resolve
    the described problem related to range-list access that
    the range-list plan should carry the lowest cost of any plans
    it beats.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM81295

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-24

  • Closed date

    2013-03-27

  • Last modified date

    2013-05-03

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

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

    UK92968

Modules/Macros

  •    DSNXOCSC
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK92968

       UP13/04/12 P F304

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



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Document information


More support for:

DB2 for z/OS

Software version:

A10

Reference #:

PM81295

Modified date:

2013-05-03

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