IBM Support

IT20518: IN DPF, WHEN UNIQUE TQ IS PRESENT IN THE PLAN AND SPECIAL INTERNAL PERF OPT IS HAPPENING, POSSIBLE DUPLICATE VALUES RETURNED

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • In DPF environment when UNIQUE TQ is present in the plan and
    Special Internal Performance optimization is happening, it is
    possible to get unexpected duplicate values returned.
    

Local fix

  • Any one of these registry variables will work around the issue:
    
    db2set DB2_SPILL=NO_HINTS
    db2set DB2_SORT_AFTER_TQ=YES
    db2set DB2_TCG_DEFAULT_OPTIONS=set disable_pushdown on
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Mutliple Node set-up                                         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Please, see error Description and install this Fix.          *
    ****************************************************************
    

Problem conclusion

  • Please, see error Description and install this Fix.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT20518

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-05-09

  • Closed date

    2018-07-16

  • Last modified date

    2018-07-16

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

    IT20440

  • 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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
29 June 2020