IBM Support

IT31145: CDE HSJN NOT PICKED UP FOR NON EQUAL PREDICATES(RANGE AND OR PREDICATES)

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APAR status

  • Closed as program error.

Error description

  • Db2 query may show poor performance for queries having CDE
tables since HASH join is not picked up for joins having OR
predicate or range predicate and there is no equality predicate.

Local fix

  • Add dummy equality predicate to the query:
nvl(mod(length(t1.col1),1),0) = nvl(mod(length(t2.col1),1),0)

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
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* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
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* RECOMMENDATION:                                              *
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Problem conclusion

  • 



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT31145
    • 

  • 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
    2019-12-03
    • 

  • Closed date
    2021-03-15
    • 

  • Last modified date
    2021-03-15
    • 





    

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

    
IT31140
    

    • 

  • 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:
            

            16 March 2021
            

            
            
          

        


        

        


      


    


  





    

  



  
    
      

      
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