IC87425: POSSIBLE HIGH CPU USAGE OF FUNCTION STMMPCFINDSIMVAR UNDER VERY HIGH WORKLOAD

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Under specific very high workload situations, function
    stmmPCfindSimVar can consume a large amount of CPU time.
    
    Configuration settings to trigger this behavior:
    * STMM enabled or disabled
    * PCKCACHESZ set to AUTOMATIC
    
    This APAR will help to reduce CPU usage of function
    stmmPCfindSimVar.
    

Local fix

  • * Set PCKCACHESZ to a fixed value
    * Make similar SQL statements look different by adding comments
    to the statment text at the end
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 Version 9.7 Fix Pack 8.                       *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 Version 9.7 Fix Pack 8.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC87425

  • 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

    2012-10-23

  • Closed date

    2013-07-01

  • Last modified date

    2013-07-01

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

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

    IC91295

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

9.7

Reference #:

IC87425

Modified date:

2013-07-01

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