Re: Strangely Variable Query Performance

От: Tom Lane
Тема: Re: Strangely Variable Query Performance
Дата: ,
Msg-id: 12360.1176436194@sss.pgh.pa.us
(см: обсуждение, исходный текст)
Ответ на: Re: Strangely Variable Query Performance  (Steve)
Ответы: Re: Strangely Variable Query Performance  (Steve)
Список: pgsql-performance

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Slow Postgresql server  (Jason Lustig, )
 Re: Slow Postgresql server  (Dennis Bjorklund, )
 Re: Slow Postgresql server  (Jeff Frost, )
 Re: Slow Postgresql server  (Ron, )
  Re: Slow Postgresql server  (Guido Neitzer, )
   Re: Slow Postgresql server  (Ron, )
    Re: Slow Postgresql server  (Guido Neitzer, )
     Re: Slow Postgresql server  (Scott Marlowe, )
      Re: Slow Postgresql server  (Jeff Frost, )
       Re: Slow Postgresql server  (Carlos Moreno, )
       Strangely Variable Query Performance  (Steve, )
        Re: Strangely Variable Query Performance  (Tom Lane, )
         Re: Strangely Variable Query Performance  (Steve, )
          Re: Strangely Variable Query Performance  (Tom Lane, )
           Re: Strangely Variable Query Performance  (Steve, )
            Re: Strangely Variable Query Performance  (Tom Lane, )
             Re: Strangely Variable Query Performance  (Steve, )
        Re: Strangely Variable Query Performance  (Scott Marlowe, )
         Re: Strangely Variable Query Performance  (Steve, )
          Re: Strangely Variable Query Performance  (Scott Marlowe, )
           Re: Strangely Variable Query Performance  (Steve, )
           Re: Strangely Variable Query Performance  (Tom Lane, )
            Re: Strangely Variable Query Performance  (Steve, )
             Re: Strangely Variable Query Performance  (Tom Lane, )
              Re: Strangely Variable Query Performance  (Steve, )
             Re: Strangely Variable Query Performance  (Tom Lane, )
              Re: Strangely Variable Query Performance  (Steve, )
               Re: Strangely Variable Query Performance  (Tom Lane, )
                Re: Strangely Variable Query Performance  (Steve, )
                 Re: Strangely Variable Query Performance  (Tom Lane, )
                  Re: Strangely Variable Query Performance  (Steve, )
                   Re: Strangely Variable Query Performance  (Tom Lane, )
                   Re: Strangely Variable Query Performance  (Tom Lane, )
                    Re: Strangely Variable Query Performance  (Steve, )
                     Re: Strangely Variable Query Performance  (Tom Lane, )
                      Fwd: Strangely Variable Query Performance  ("Robins Tharakan", )
                     choose_bitmap_and again (was Re: Strangely Variable Query Performance)  (Tom Lane, )
                      Re: [HACKERS] choose_bitmap_and again (was Re: Strangely Variable Query Performance)  (Alvaro Herrera, )
                       Re: [HACKERS] choose_bitmap_and again (was Re: Strangely Variable Query Performance)  (Tom Lane, )
                       Re: [HACKERS] choose_bitmap_and again (was Re: Strangely Variable Query Performance)  (Tom Lane, )
              Re: Strangely Variable Query Performance  (Steve, )
             Re: [HACKERS] choose_bitmap_and again (was Re: Strangely Variable Query Performance)  (Tom Lane, )
 Re: Slow Postgresql server  (Jeff Frost, )
  Re: Slow Postgresql server  (Jason Lustig, )
   Re: Slow Postgresql server  (Guido Neitzer, )
 Fwd: Strangely Variable Query Performance  (Robins, )
  Re: Fwd: Strangely Variable Query Performance  (Tom Lane, )

Steve <> writes:
> Just dropping that index had no effect, but there's a LOT of indexes that
> refer to receipt.  So on a hunch I tried dropping all indexes that refer
> to receipt date and that worked -- so it's the indexes that contain
> receipt date that are teh problem.

I'm still not having any luck reproducing the failure here.  Grasping at
straws again, I wonder if it's got something to do with the order in
which the planner examines the indexes --- which is OID order.  Could
you send me the results of

select indexrelid::regclass from pg_index where indrelid = 'detail_summary'::regclass order by indexrelid;

            regards, tom lane


В списке pgsql-performance по дате сообщения:

От: "Avdhoot Kishore Saple"
Дата:
Сообщение: local selectivity estimation - computing frequency of predicates
От: Tom Lane
Дата:
Сообщение: Re: local selectivity estimation - computing frequency of predicates