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IC95053: THE QUERY STATEMENT WITH A SUBQUERY PREDICATE MIGHT NOT RETURN ROWS AFTER ENABLING DB2_COMPATIBILITY_VECTOR=ORA

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The following are the necessary conditions that might cause the
    problem of "0 record(s) selected" to occur:
    
    - The DB2_COMPATIBILITY_VECTOR registry variable is set to ORA
    - A "X IN (select Y from <subquery>)" query predicate.
    - X is the CHAR type, and Y is the VARCHAR type.
    
    To verify that this problem has occurred in your query, generate
    the db2exfmt command and
    search if the optimized statement contains the following:
    
    - "(Q<num>.X >= $C3 )"
    - "(Q<num>.X <= $C2)"
    
    Also, check to see if the plan details contain:
    
    - "(ORA_VARCHAR(Q<num>.X) <= $C1 )"
    -  "(ORA_VARCHAR((Q<num>.X)>= $C0)".
    

Local fix

  • Rewrite the IN predicate to the EXISTS predicate:
    
    select *
    from table1
    where pk_alansawyer in
       (select pk_christine
       from table2);
    
    to
    
    select *
    from table1
    where exists
       (select 1
       from table2 where pk_alansawyer = pk_christine);
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users                                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 version 10.1.0.3.                             *
    ****************************************************************
    

Problem conclusion

  • The problem is first fixed in DB2 version 10.1.0.3.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC95053

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-08-20

  • Closed date

    2013-09-27

  • Last modified date

    2013-09-27

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

    IC91110

  • 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

  • RA10 PSN

       UP

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"10.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
27 September 2013