IBM Support

IC78107: INADEQUATE INDEX LEAF PAGE READAHEAD DONE DURING REORG INDEX CLEANUP ONLY LEADING TO POOR PERFORMANCE

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The "reorg index for table .... cleanup only" option  uses a
    readahead algorithm to asynchronously load index leaf pages into
    the bufferpool.  However, there is a problem with readahead
    algorithm causing it to not prefetch all of the pages that it
    should when the index contains an extremely large number of
    duplicate records.
    
    Hence the db2agent processing the cleanup operation needs to
    synchronously load too many pages into the bufferpools, leading
    to bad performance of the reorg command.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * all                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply DB2 v9.7 Fix Pack 6                                    *
    ****************************************************************
    

Problem conclusion

  • This problem has first been fixed in V9.7 Fix Pack 6
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC78107

  • 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

    2011-08-12

  • Closed date

    2012-06-18

  • Last modified date

    2012-06-18

  • 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:
18 June 2012