IBM Support

IT34787: MON_UOW_EXECLIST CONSUMES MONHEAP EVEN WHEN OFF

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APAR status

  • Closed as program error.

Error description

  • When the MON_UOW_EXECLIST database configuration parameter is
set to OFF every Db2 application will still consume monitor heap
relating to Executable ID list collection.  This could result in
other processing failing to get monitor heap.  This in turn
could lead to a FODC_Memory diagnostic collection.  Here is a
sample stack that shows other processing failing to get monitor
heap:
fd_select
sqloReadNamedPipe
sqloReadVendorRC
sqloInvokeVendorFunction
pdVendorCallWrapper
pdInvokeCalloutScriptViaVendorAPI
dumpOnOOM
sqloMemLogPoolConditions
sqloGetMemoryBlockExtended
GetFastWriterRecord
collectRequestorActivities
collectLockEvent
sqlplWaitOnWP
sqlplMakeNewRequestNonSD
sqlplrq
sqliLockUncond
sqliLockForReadUncond
sqli_proc_leaf
sqlischf
sqlirdk
sqldIndexFetch
sqldRowFetch
sqlriFetch

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:                                              *
* all                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Db2 11.1.4.6 or higher                            *
****************************************************************

    



Problem conclusion


    

  • Upgrade to Db2 11.1.4.6 or higher

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT34787
    • 

  • Reported component name
    DB2 FOR LUW
    • 

  • Reported component ID
    DB2FORLUW
    • 

  • Reported release
    B10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2020-11-04
    • 

  • Closed date
    2021-03-31
    • 

  • Last modified date
    2021-03-31
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    DB2 FOR LUW
    • 

  • Fixed component ID
    DB2FORLUW
    • 



Applicable component levels


    








      
          
                    

          

          [{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1"}]
          

                    

        
        

        

      


      


        

            

            
Document Information


            

            


                        

            Modified date:
            

            01 April 2021
            

            
            
          

        


        

        


      


    


  





    

  



  
    
      

      
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