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IC74063: INCORRECT STATEMENT INFORMATION REPORTED IN APPLICATION SNAPSHOT ACCOMPANIED BY INCREASING MONITOR HEAP CONSUMPTION AND SQL PERF

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APAR status

  • Closed as program error.

Error description

  • An application repeatedly executing a routine within the same
    UOW may experience incorrect application snapshot information,
    memory growth in monitor heap,  and performance degradation.  In
    order for this problem to occur,  the following conditions must
    be satisfied:
    
    - Statement monitoring is on
    - The application calls a UDF or routine repeatedly within the
    same UOW and the routine issues SQL statements
    - The symptoms are likely to be more pronounced if MON_HEAP_SZ
    is set to AUTOMATIC or a large fixed value
    
    Application snapshots will contain increasing numbers of
    repeated statement elements with the same package/section/cursor
    information.  Increasing growth of memory allocations from the
    monitor heap may also be observed,  and SQL statements executed
    by the application may experience gradual performance
    degradation.
    

Local fix

  • In some cases a temporary fix of configuring MON_HEAP_SZ to a
    small fixed value has helped.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users using DB2 V9.7 FP3a and below are affected.            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * An application repeatedly executing a routine within the     *
    * same UOW may experience incorrect application snapshot       *
    * information, memory growth in monitor heap,  and performance *
    * degradation.                                                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Please upgrade to DB2 V9.7 FP4 to avail a fix for this APAR. *
    ****************************************************************
    

Problem conclusion

  • The issue is fixed in DB2 V9.7 FP4
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC74063

  • 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

    2011-01-24

  • Closed date

    2011-05-02

  • Last modified date

    2011-05-02

  • 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 PSY

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC74063

Modified date: 02 May 2011