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IT36139: PERFORMANCE IMPACTS WITH HUGE AMOUNT OF ROW LOCKS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Querying or modifying millions of sequential table records may
    result in unexpected long response times.
    The used hashing algorithm for the internal lock handling leads
    to an anomaly in the locklist size ranges.
    Some ranges, e.g locklist is between 2097121 and 2097152, may
    increase the response time of such a transaction significantly.
    

Local fix

  • Use LOCK TABLE statement to avoid the need to acquire large
    number of row locks
    or
    Use a fixed locklist of a "good" size
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * AIX/Linux                                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to db2 v11.1.4.7                                     *
    ****************************************************************
    

Problem conclusion

  • Upgrade to db2 v11.1.4.7
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT36139

  • 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

    2021-03-08

  • Closed date

    2022-04-17

  • Last modified date

    2022-04-17

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

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

    IT36140

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RB10 PSY

       UP

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
04 May 2022