PM27097: SUPPORT TO START AND MAINTAIN A MINIMUM NUMBER OF WLM STORED PROCEDURE ADDRESS SPACES

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Support to start and maintain a minimum number of WLM stored
    procedure address spaces
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of DB2 9 and DB2 10 stored         *
    *                 procedures and udf.                          *
    ****************************************************************
    * PROBLEM DESCRIPTION: WLM-SPAS start up is a big overhead     *
    *                      and sometimes on production it leads    *
    *                      to sp request time-outs if an address   *
    *                      space needs to be started.              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DB2 WLM-SPAS tasks are managed by WLM and WLM controls when a
    new address space needs to be started. The request is to use
    WLM service to start and keep a minimum number of WLM-SPAS
    so that a spike on SP request does not incur a heavy
    overhead in middle of operation.
    

Problem conclusion

  • A new option to be specified on the parameter to DSNX9WLM on
    the WLM startup JCL is introduced so user can specify a minimum
    number of address spaces to be kept for that particular
    environment. If this parameter is not specified, existing
    behavior prior to this change applies and WLM controls how
    many WLM-SPAS to keep.
    
    This new option will be implemented as new parameter to
    DSNX9WLM to the WLM start up JCL.
    
    For example:
    //DSN8WLMP PROC DB2SSN=DSN,NUMTCB=5,APPLENV=WLMTPSMP,MNSPAS=3
    ...
    //WLMTPSMP EXEC PGM=DSNX9WLM,TIME=1440,
    //              PARM='&DB2SSN,&NUMTCB,&APPLENV,&MNSPAS',
    //              REGION=0M
    
    In the above example, a minimum of 3 WLM-SPAS will be started
    each with NUMTCB = 5. WLM will start the minimum number of
    address spaces on the first stored procedure request on that
    WLM environment.
    
    The valid number specified for the values of MNSPAS is between
    0 to 50. A value of 0 means no minimum is specified and old
    behavior will apply. If the value of MNSPAS is invalid,
    message DSNX981E will be issued.  If the new parameter is not
    specified, there will be no impact to the existing user base.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM27097

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    YesSpecatt / New Function

  • Submitted date

    2010-11-18

  • Closed date

    2011-03-16

  • Last modified date

    2012-01-16

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

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

    UK65858 UK65859

Modules/Macros

  •    DSNX9WLM
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK65858

       UP11/03/31 P F103

  • R910 PSY UK65859

       UP11/03/31 P F103

Fix is available

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Document information


More support for:

DB2 for z/OS

Software version:

910

Reference #:

PM27097

Modified date:

2012-01-16

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