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IT29771: UPDATE OF STATS USING "DB2LOOK -D <DB_NAME> -Z <SCHEMA_NAME> -T <TABLE_NAME> -M -C -R" OUTPUT CAUSES DEADLOCKS

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APAR status

  • Closed as program error.

Error description

  • On highly transactional and available systems, users dont run
    the actual runstats but update the stats manually using db2look
    mimic.
    
    When db2look mimic has been generated on a specific table, it
    also generates 3 updates of sysstat.functions: one full update
    of the table with defaults, the other two updates pertaining to
    explain tables.
    
    The full update of sysstat.functions table may cause deadlock
    when ran along with active transactions.
    
    And the updates of sysstat.functions are unnecessary when mimic
    is requested only for a specific table.
    

Local fix

  • Before updating the stats manually, please remove the updates of
    sysstat.functions.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 5
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT29771

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-07-18

  • Closed date

    2020-01-16

  • Last modified date

    2020-01-16

  • 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

  • RB10 PSN

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
16 January 2020