Re: Odd blocking (or massively latent) issue - even with EXPLAIN

Поиск
Список
Период
Сортировка
От Jim Vanns
Тема Re: Odd blocking (or massively latent) issue - even with EXPLAIN
Дата
Msg-id 1343122451.12579.155.camel@sys367.ldn.framestore.com
обсуждение исходный текст
Ответ на Re: Odd blocking (or massively latent) issue - even with EXPLAIN  ("Martin French" <Martin.French@romaxtech.com>)
Список pgsql-performance
> > That latter test - won't that pretty much just read from the page
> cache?
> > 'sync' may well have forced dirty pages to disk but does it actually
> > evict them to?
>
> Basically, the cache is avoided because of the size of the file.
> 6000000 blocks at 8k exceeds the size of RAM in the machine, so it
> *should* miss the cache and hit the disk directly. :)

Doh!

> >
> > Anyway, that is off topic... perhaps ;)
> >
> > Thanks again,
> >
> > Jim
> >
>
> Cheers
>
> Martin ============================================= Romax Technology
> Limited Rutherford House Nottingham Science & Technology Park
> Nottingham, NG7 2PZ England Telephone numbers: +44 (0)115 951 88 00
> (main) For other office locations see:
> http://www.romaxtech.com/Contact =================================
> =============== E-mail: info@romaxtech.com Website: www.romaxtech.com
> ================================= ================ Confidentiality
> Statement This transmission is for the addressee only and contains
> information that is confidential and privileged. Unless you are the
> named addressee, or authorised to receive it on behalf of the
> addressee you may not copy or use it, or disclose it to anyone else.
> If you have received this transmission in error please delete from
> your system and contact the sender. Thank you for your cooperation.
> =================================================
>

--
Jim Vanns
Systems Programmer
Framestore


В списке pgsql-performance по дате отправления:

Предыдущее
От: "Martin French"
Дата:
Сообщение: Re: Odd blocking (or massively latent) issue - even with EXPLAIN
Следующее
От: Thomas Kellerer
Дата:
Сообщение: Using ctid column changes plan drastically