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PM49816: REAL STORAGE INSTRUMENTATION ENHANCEMENT

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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
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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