Re: Piggybacking vacuum I/O

Поиск
Список
Период
Сортировка
От Bruce Momjian
Тема Re: Piggybacking vacuum I/O
Дата
Msg-id 200701252303.l0PN34D14164@momjian.us
обсуждение исходный текст
Ответ на Re: Piggybacking vacuum I/O  (Heikki Linnakangas <heikki@enterprisedb.com>)
Ответы Re: Piggybacking vacuum I/O  (Heikki Linnakangas <heikki@enterprisedb.com>)
Список pgsql-hackers
Is there a TODO here?

---------------------------------------------------------------------------

Heikki Linnakangas wrote:
> Pavan Deolasee wrote:
> > Another simpler solution for VACUUM would be to read the entire CLOG file
> > in local memory. Most of the transaction status queries can be satisfied
> > from
> > this local copy and the normal CLOG is consulted only when the status is
> > unknown (TRANSACTION_STATUS_IN_PROGRESS)
> 
> The clog is only for finished (committed/aborted/crashed) transactions.
> If a transaction is in progress, the clog is never consulted. Anyway,
> that'd only be reasonable for vacuums, and I'm actually more worried if
> we had normal backends thrashing the clog buffers.
> 
> -- 
>    Heikki Linnakangas
>    EnterpriseDB   http://www.enterprisedb.com
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
> 
>                http://archives.postgresql.org

--  Bruce Momjian   bruce@momjian.us EnterpriseDB    http://www.enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +


В списке pgsql-hackers по дате отправления:

Предыдущее
От: Martijn van Oosterhout
Дата:
Сообщение: Re: No ~ operator for box, point
Следующее
От: Bruce Momjian
Дата:
Сообщение: Re: DROP FUNCTION failure: cache lookup failed for