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PK55089: IRLM LOOPING IN DXRRS291 WHILE PROCESSING QUERY REQUEST FROM DB2

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APAR status

  • Closed as program error.

Error description

  • IRLM looping in DXRRS291 processing QUERY request from DB2. This
QUERY request came via DB2 PE using IFI calls. The QUERY to IRLM
can also come from DISPLAY DB command with LOCKS. The looping
was not due to a bad chain, but rather a bug in the traversal
logic.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: All DB2 V8 NFM users of IRLM 2.2 (HIR2220) - *
*                 locking protocol 2.                          *
****************************************************************
* PROBLEM DESCRIPTION: System hang due to looping in DXRRL291  *
*                      IRLM code for query locks.              *
****************************************************************
* RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
****************************************************************
DB2 Performance Expert was driving query locks requests to IRLM
and a somewhat unusual set of relationships between existing
locks resulted in IRLM query code looping while walking the lock
relationship chains.  The loop caused the DB2 member to hang.

    



Problem conclusion


    

  • AIDS: RIDS/IRLM RIDS/REQ IRLM IRLM/REQ
  GEN:
SYSPLEXDS
64BITIMS

*** END IMS KEYWORDS ***
Use of multi-row-cursor or release-locks-at-close-cursor created
the special types of locks involved in creating the looping
condition.  The traversal code used in the IRLM query routine
has been corrected to avoid the loop.

    



Temporary fix


    

  • *********
* HIPER *
*********

    



Comments


    

  • 



APAR Information




    

  • APAR number
    PK55089
    • 

  • Reported component name
    IRLM V2
    • 

  • Reported component ID
    569516401
    • 

  • Reported release
    220
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2007-10-19
    • 

  • Closed date
    2007-12-06
    • 

  • Last modified date
    2008-04-30
    • 





    

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

    • 

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

    
UK32011
    

    • 



Modules/Macros


    

  • DXRIOTSC DXRRC1QF DXRRC291 DXRRL1QF DXRRL291
DXRRS1QF DXRRS291

    



Fix information


    

  • Fixed component name
    IRLM V2
    • 

  • Fixed component ID
    569516401
    • 



Applicable component levels


    

  • R220  PSY  UK32011
       UP07/12/22  P  F712
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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              [{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPHL","label":"IRLM"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"220","Edition":"","Line of Business":{"code":"","label":""}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            30 April 2008
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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