IBM Support

IT35926: WRONG RESULT WITH MULTIDIMENSIONAL CLUSTERING (MDC) TABLE AND ZIGZAG JOIN (ZZJN)

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APAR status

  • Closed as program error.

Error description

  • Db2 query may generate wrong result (loose rows) when
    - inner table for ZZJN is Multidimensional Clustering (MDC)
    table
    - row compression enable for MDC table.
    - block index predicate (i.e predicate on columns used in the
    dimension clause)
    - along with data-sargable predicate
    

Local fix

  • Turn off ZZJN by issuing db2set -im
    DB2_REDUCED_OPTIMIZATION="ZZJN OFF"
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * First fixed in Db2 11.5 Mod 6 Fixpack 0                      *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.5 Mod 6 Fixpack 0
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT35926

  • 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

    2021-02-16

  • Closed date

    2021-06-21

  • Last modified date

    2021-06-23

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

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

    IT38081

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

[{"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:
21 August 2021