От: Tom Lane
Тема: Re: Oddity with view
Дата: ,
Msg-id: 11916.1226341898@sss.pgh.pa.us
(см: обсуждение, исходный текст)
Ответ на: Re: Oddity with view  (Jim 'Decibel!' Nasby)
Список: pgsql-performance

Скрыть дерево обсуждения

Oddity with view  (Jim 'Decibel!' Nasby, )
 Re: Oddity with view  (Tom Lane, )
  Re: Oddity with view  (Jim 'Decibel!' Nasby, )
   Re: Oddity with view  (Richard Huxton, )
    Re: Oddity with view (now with test case)  (Jim 'Decibel!' Nasby, )
     Re: Oddity with view (now with test case)  (Tom Lane, )
      Re: Oddity with view (now with test case)  (Jim 'Decibel!' Nasby, )
       Re: Oddity with view (now with test case)  (Tom Lane, )
        Re: Oddity with view (now with test case)  (Jim 'Decibel!' Nasby, )
         Re: Oddity with view (now with test case)  (Tom Lane, )
          Re: Oddity with view (now with test case)  (Jim 'Decibel!' Nasby, )
           Re: Oddity with view (now with test case)  (Tom Lane, )
   Re: Oddity with view  (Tom Lane, )

"Jim 'Decibel!' Nasby" <> writes:
> How on earth did the seqscan suddenly take 4x longer? And why is the
> subquery scan then doubling the amount of time again?

Maybe the disk access is less sequential because of the need to fetch
the other table too?

            regards, tom lane


В списке pgsql-performance по дате сообщения:

От: Jim 'Decibel!' Nasby
Дата:
Сообщение: Re: Oddity with view (now with test case)
От: Tom Lane
Дата:
Сообщение: Re: Oddity with view (now with test case)