Re: How much expensive are row level statistics?

Поиск
Список
Период
Сортировка
От Bruce Momjian
Тема Re: How much expensive are row level statistics?
Дата
Msg-id 200512170244.jBH2iJV11094@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: How much expensive are row level statistics?  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-performance
Tom Lane wrote:
> Michael Fuhr <mike@fuhr.org> writes:
> > Further tests show that for this application
> > the killer is stats_command_string, not stats_block_level or
> > stats_row_level.
>
> I tried it with pgbench -c 10, and got these results:
>     41% reduction in TPS rate for stats_command_string

Woh, 41%.  That's just off the charts!  What are we doing internally
that would cause that?

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

В списке pgsql-performance по дате отправления:

Предыдущее
От: Kyle Cordes
Дата:
Сообщение: Re: Overriding the optimizer
Следующее
От: Bruce Momjian
Дата:
Сообщение: Re: Should Oracle outperform PostgreSQL on a complex