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PM49816: REAL STORAGE INSTRUMENTATION ENHANCEMENT

A fix is available

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You can track all active APARs for this component.

 

APAR status

  • Closed as new function.

Error description

  • REAL STORAGE INSTRUMENTATION ENHANCEMENT
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 A10 HDBAA10 users.                   *
    ****************************************************************
    * PROBLEM DESCRIPTION: High DB2 Master CPU noticed on idle     *
    *                      system where multiple DB2 V10 are       *
    *                      active.                                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When COUNTPAGES is performed to determine the REAL frame backing
    rate for a given range of 64bit storage, the CPU time used by
    DB2 MSTR on an idle system was high.  This is due to
    serialization latching to perform the frame count.  If performed
    on a normally busy system, the usage would likely not be
    noticed.
    

Problem conclusion

Temporary fix

Comments

  • Usage of a new keyword on the countpages will allow the frame
    count to occur unserialized.  This code is only enabled after
    z/OS OA37821 has been applied and MVS is IPL.  Either apar
    may be applied without the other but function doesn't occur
    until they are both applied.
    

APAR Information

  • APAR number

    PM49816

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-10-11

  • Closed date

    2011-12-15

  • Last modified date

    2012-01-01

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

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

    UK74840

Modules/Macros

  • DSNDQWHS DSNLTMSC DSNTXSTB DSNWVINT
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK74840

       UP11/12/31 P F112

Fix is available

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Document Information

Modified date:
01 January 2012