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IT35377: WRONG RESULT IN A VERY SPECIFIC PLAN/SPECIFIC DATA FLOW WITH NLJN AND DATAPART TABLE ON THE INNER AND NULL KEYS.

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APAR status

  • Closed as program error.

Error description

  • We could loose a row in the result set in a very rare scenario:
    - data partitioned table on the inner of NLJN
    - NULL key values coming from the outer of NLJN first
    - good key that needs a match comes from the outer right after
    all the NULL keys
    
    It is a very rare scenario which depends on a very rare plan as
    well as a rare data flow.
    

Local fix

  • Change query/plan to avoid NLJN or flip the sides of NLJN in the
    plan using OPTGUIDELINES.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to db2_v115m5fp1 or later                            *
    ****************************************************************
    

Problem conclusion

  • Upgrade to db2_v115m5fp1 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT35377

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B50

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-12-29

  • Closed date

    2021-03-31

  • Last modified date

    2021-03-31

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

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

    IT35400

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RB50 PSY

       UP

[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.5"}]

Document Information

Modified date:
31 August 2021