Re: index / sequential scan problem

От: Dennis Björklund
Тема: Re: index / sequential scan problem
Дата: ,
Msg-id: Pine.LNX.4.44.0307182037580.4146-100000@zigo.dhs.org
(см: обсуждение, исходный текст)
Ответ на: Re: index / sequential scan problem  (Tom Lane)
Список: pgsql-performance

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index / sequential scan problem  (Fabian Kreitner, )
 Re: index / sequential scan problem  ("Shridhar Daithankar", )
  Re: index / sequential scan problem  (Fabian Kreitner, )
   Re: index / sequential scan problem  ("Shridhar Daithankar", )
 Re: index / sequential scan problem  (Paul Thomas, )
  Re: index / sequential scan problem  (Fabian Kreitner, )
   Re: index / sequential scan problem  (Paul Thomas, )
    Re: index / sequential scan problem  (Fabian Kreitner, )
     Re: index / sequential scan problem  ("Shridhar Daithankar", )
     Re: index / sequential scan problem  (Jord Tanner, )
     Re: index / sequential scan problem  (Paul Thomas, )
      Re: index / sequential scan problem  (Tom Lane, )
   Re: index / sequential scan problem  (Tom Lane, )
    Re: index / sequential scan problem  (Fabian Kreitner, )
     Re: index / sequential scan problem  (Fabian Kreitner, )
      Re: index / sequential scan problem  (Dennis Björklund, )
       Re: index / sequential scan problem  (Tom Lane, )
        Re: index / sequential scan problem  ("scott.marlowe", )
        Re: index / sequential scan problem  (Dennis Björklund, )

On Fri, 18 Jul 2003, Tom Lane wrote:

> >> Adjusting the cpu_tuple_cost to 0.042 got the planner to choose the index.
>
> > Doesn't sound very good and it will most likely make other queries slower.
>
> Seems like a reasonable approach to me --- certainly better than setting
> random_page_cost to physically nonsensical values.

Hehe, just before this letter there was talk about changing
random_page_cost. I kind of responed that 0.042 is not a good random page
cost. But now of course I can see that it says cpu_tuple_cost :-)

Sorry for adding confusion.

--
/Dennis



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