Re: HashJoin order, hash the large or small table? Postgres likes to hash the big one, why?

Поиск
Список
Период
Сортировка
От Kevin Grittner
Тема Re: HashJoin order, hash the large or small table? Postgres likes to hash the big one, why?
Дата
Msg-id 4CBD6FFF0200002500036B27@gw.wicourts.gov
обсуждение исходный текст
Ответ на Re: HashJoin order, hash the large or small table? Postgres likes to hash the big one, why?  (Mladen Gogala <mladen.gogala@vmsinfo.com>)
Список pgsql-performance
Mladen Gogala <mladen.gogala@vmsinfo.com> wrote:

> how is the query cost calculated? What are
> the units? I/O requests? CPU cycles? Monopoly money?

http://www.postgresql.org/docs/current/interactive/runtime-config-query.html#RUNTIME-CONFIG-QUERY-CONSTANTS

-Kevin

В списке pgsql-performance по дате отправления:

Предыдущее
От: Tom Lane
Дата:
Сообщение: Re: odd postgresql performance (excessive lseek)
Следующее
От: Jon Nelson
Дата:
Сообщение: Re: odd postgresql performance (excessive lseek)