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IC78033: INSERT TAKES A LONG TIME TO COMPILE WHEN INSERTING INTO A TABLE WITH AUTO-GENERATED and BIT STRING COLUMNS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When trying to execute an INSERT statement to a table having
    auto-generated and bit string columns, it is noticed that it
    takes a long time to complete.
    
    If capture stacks during the insert statement compilation, the
    following stack repeats. db2trc -perfcount shows
    sqlnr_check_redundant_prd() takes long time.
    
    UDT_colequiv_exp
    sqlnr_check_redundant_prd
    sqlnr_constpu_action
    sqlnr_comp
    sqlnr_seq
    sqlnr_rcc
    sqlnr_perqun_action
    sqlnr_comp
    sqlnr_priority
    sqlnr_rcc
    sqlnr_allqun_action
    sqlnr_comp
    sqlnr_seq
    sqlnr_rcc
    sqlnr_start_action
    sqlnr_comp
    sqlnr_seq
    sqlnr_rcc
    sqlnr_exe
    
    This happens if the following conditions are met:
    
      o It is up to DB2 to generate a value for generated column
      o Client is trying to insert any value to binary column
      o Database collation is not IDENTITY
    
    For example:
    
    create table N (
        i int generated by default as identity (starting from 0,
    increment by 1),
        c char(1) for bit data);
    
    insert into N (c) values (x'00');
    

Local fix

  • If the insert statement can be modified, explicitly specify a
    value for the generated column. For example,
    insert into N (i, c) values (1, x'00');
    
    If the insert statement cannot be modified, create a database
    using IDENTITY collation and move data over to the new database.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * DB2 V9.7 users.                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * When trying to execute an INSERT statement to a table having *
    * auto-generated and bit string columns, it is noticed that it *
    * takes a long time to complete.                               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * If the insert statement can be modified, explicitly specify  *
    * a                                                            *
    * value for the generated column. For example,                 *
    * insert into N (i, c) values (1, x'00');                      *
    *                                                              *
    * If the insert statement cannot be modified, create a         *
    * database                                                     *
    * using IDENTITY collation and move data over to the new       *
    * database.                                                    *
    ****************************************************************
    

Problem conclusion

  • Problem has been fixed in V9.7FP5.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC78033

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-08-10

  • Closed date

    2012-02-08

  • Last modified date

    2012-02-08

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

  • 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

  • R970 PSN

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPGG","label":"DB2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.7","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
08 February 2012