LI75022: MEMORY LEAK IN APPLICATION HEAP CAUSED BY UDFS OR STORED PROCEDURES WHEN CLIENT AND SERVER HAS DIFFERENT CODE PAGE.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • This memory leak is caused by running UDFs when the following
    two conditions are true:
    
    1) your clientapplication and database server has different
       code pages
    2) the connection concentrator is enabled. DB2 Connection
       concentrator is activated when you set the number of maximum
       logical agents (max_connections) higher than the number of
       coordinating agents (max_coordagents).
    
    You may experience frequent out of application heap error
    messages due to this. The error message may look something
    like this:
    
    SQL0954C  Not enough storage is available in the application
    heap to process the statement.  SQLSTATE=57011
    
    
    Running the following db2pd command will show you a single
    application heap increasing as you repeat the execution of the
    UDF:
    
    
    db2pd -db <dbname> -memblocks appctl top
    
    -------------------------------------------------
    Top memory consumers in AppCtl memory set:
    PoolID     PoolName   TotalSize(Bytes)     %Bytes  TotalCount
    %Count    LOC          File
         1         apph         4923381504      86.45     2562612
    1.68    117     3551095165
         1         apph          486051840       8.53     2531520
    0.17    117     3551095165
    
    -------------------------------------------------
    

Local fix

  • Disabling connection concentrator will prevent the memory leak.
    
    NOTE: DB2 connection concentrator is activated when you set the
    number of maximum logical agents (max_connections) higher than
    the number of coordinating agents (max_coordagents).
    

Problem summary

  • USERS AFFECTED:
    ===============
    Customer using version 9.5 and above on all platforms.
    
    PROBLEM DESCRIPTION:
    ====================
    It user application runs UDFs very frequently under the
    following two conditions, database will experience the memory
    leak in application heap and cause frequent out of memory
    errors:
    .
    1) your clientapplication and database server has different
       code pages
    2) the connection concentrator is enabled. DB2 Connection
       concentrator is activated when you set the number of maximum
       logical agents (max_connections) higher than the number of
       coordinating agents (max_coordagents).
    
    RECOMMENDATION:
    ===============
    Disabling connection concentrator will prevent the memory leak.
    

Problem conclusion

  • Problem is first fixed in version 9.5 Fixpack 6.
    

Temporary fix

  • Disabling connection concentrator will prevent the memory leak.
    

Comments

APAR Information

  • APAR number

    LI75022

  • Reported component name

    DB2 CEE LINUX

  • Reported component ID

    5765F3004

  • Reported release

    950

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-11-20

  • Closed date

    2011-03-23

  • Last modified date

    2011-03-23

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

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

    IC64834

Fix information

  • Fixed component name

    DB2 CEE LINUX

  • Fixed component ID

    5765F3004

Applicable component levels

  • R950 PSY

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

950

Reference #:

LI75022

Modified date:

2011-03-23

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