IBM Support

IZ07759: USING ALTERNATE PAGE CLEANING CAN LEAD TO EXCESSIVE CLEANING OF PAGES IN TEMPSPACE.

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

  • When the DB2_USE_ALTERNATE_PAGE_CLEANING registry variable is
enabled, proactive page cleaning may flush temporary pages to
disk.  This may cause additional I/O against the temporary
tablespace and may also cause the temporary tablespace to become
full.

Creating a dedicated bufferpool for temporary tablespaces will
help reduce the possibility of temporary pages being evicted to
make room for permanent pages and will generally improve
performance.

Local fix

  • Workaround: Disable the DB2_USE_ALTERNATE_PAGE_CLEANING registry
variable.

Problem summary

  • When the DB2_USE_ALTERNATE_PAGE_CLEANING registry variable is
enabled, proactive page cleaning may flush temporary pages to
disk.  This may cause additional I/O against the temporary
tablespace and may also cause the temporary tablespace to become
full.

Creating a dedicated bufferpool for temporary tablespaces will
help reduce the possibility of temporary pages being evicted to
make room for permanent pages and will generally improve
performance.

Problem conclusion

  • First fixed in DB2 UDB Version v9.5, FixPak 1 (Sysrout Of:
IZ00889, first fixed in V9.1 FixPak 4),

Temporary fix

  • Workaround: Disable the DB2_USE_ALTERNATE_PAGE_CLEANING registry
variable.

Comments

  • 



APAR Information




    

  • APAR number
    IZ07759
    • 

  • Reported component name
    DB2 UDB ESE SOL
    • 

  • Reported component ID
    5765F4102
    • 

  • Reported release
    950
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2007-11-01
    • 

  • Closed date
    2008-05-21
    • 

  • Last modified date
    2008-05-21
    • 





    

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

    
IZ00889
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    DB2 UDB ESE SOL
    • 

  • Fixed component ID
    5765F4102
    • 



Applicable component levels


    

  • R950  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            01 October 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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