IBM Support

LI72656: TAUTOLOGY PREDICATE PUSH DOWN THROUGH A SELF-JOIN COMMON EXPRESSION MAY CRASH THE DATABASE

Fixes are available

DB2 Version 9.5 Fix Pack 3b for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 1  for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 2a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 2  for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 4  for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 4a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • If a predicate that will be proved to be a tautology in DB2
Query Rewrite pushes down through a common expression and the
common expression are self-joined, this may crash the
database.  A trap file might have a similar below stack
traceback:

<StackTrace>
--EBP------EIP------ARGS-----------------------------
pushed_in_qun
sqlnr_cse_ppd_chk
sqlnr_local_magic_detail
sqlnr_localmagic_action
sqlnr_comp
sqlnr_rcc
sqlnr_magic_detail_action
sqlnr_comp
sqlnr_rcc
   :

The problem needs to go to various query rewrites so it is
impossible to write the whole story and all examples.

Local fix

  • N/A

Problem summary

  • see problem description

Problem conclusion

  • First fixed in DB2 UDB Version 9.5, FixPak 1

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    LI72656
    • 

  • Reported component name
    DB2 UDE ESE LIN
    • 

  • Reported component ID
    5765F4104
    • 

  • Reported release
    950
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2007-11-06
    • 

  • Closed date
    2008-05-15
    • 

  • Last modified date
    2008-05-15
    • 





    

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

    
LI72449
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    DB2 UDE ESE LIN
    • 

  • Fixed component ID
    5765F4104
    • 



Applicable component levels


    

  • R910  PSY
       UP
    • 

  • R950  PSY
       UP
    • 








      
          
                    

          

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Document Information


            

            


                        

            Modified date:
            

            15 May 2008
            

            
            
          

        


        

        


      


    


  





    

  



  
    
      

      
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