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PK44040: HIGH CPU DUE TO LOOP IN CQM ADDRESS SPACE

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APAR status

  • Closed as program error.

Error description

  • High CPU due to Loop in CQM address space.  Loop may appear in
CQMMEXCP or CQMMEXCW.  Poor performance in CQM.
For the LOOP in CQMMEXCP, SYSTRACE entries may look like
00 0175 04C36550  SSRB       077C6000 976182EE (PK27444 level)
00 0175 00000000  EXT   1005 077C6000 976182EC
00 0175 00000000  EXT   1005 077C6000 976182F6
03 0175 04C36550  SSRB       077C6000 976182F6
03 0175 00000000  EXT   1005 077C6000 9761831C
03 0175 00000000  EXT   1005 077C6000 976182EE
03 0175 00000000  EXT   1005 077C4000 97618332
03 0175 00000000  EXT   1005 077C6000 9761831C
03 0175 00000000  EXT   1005 077C4000 97618332
03 0175 00000000  EXT   1005 077C5000 9761833C
... with the ADDRESS of CQMMEXCP being 17618000 in ECSA.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: All users of IBM DB2 Query Monitor.          *
****************************************************************
* PROBLEM DESCRIPTION: High CPU due to Loop in CQM address     *
*                      space.  Loop may appear in CQMMEXCP     *
*                      or CQMMEXCW.  Poor performance in       *
*                      CQM.                                    *
*                      Local Fix:  None                        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Code changes have been made to address these issues.

    



Problem conclusion


    

  • Apply PTF.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PK44040
    • 

  • Reported component name
    DB2 QUERY MONIT
    • 

  • Reported component ID
    5655E6701
    • 

  • Reported release
    220
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2007-04-25
    • 

  • Closed date
    2007-06-06
    • 

  • Last modified date
    2007-07-03
    • 





    

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

    • 

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

    
UK25836 UK25837
    

    • 



Modules/Macros


    

  •    CQMMACTV CQMMALRT CQMMEXCP CQMMFREE CQMMFRE1
CQMMHSTV CQMMHST9 CQMMINDB CQMMSTRM

    



Fix information


    

  • Fixed component name
    DB2 QUERY MONIT
    • 

  • Fixed component ID
    5655E6701
    • 



Applicable component levels


    

  • R220  PSY  UK25836
       UP07/06/14  P  F706
    • 

  • R221  PSY  UK25837
       UP07/06/14  P  F706
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
You will be required to sign in. Distribution on physical
media is not available in all countries.
    








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            10 August 2024
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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