Re: Pre-allocated free space for row
| От | Simon Riggs |
|---|---|
| Тема | Re: Pre-allocated free space for row |
| Дата | |
| Msg-id | 1125522424.3956.4.camel@localhost.localdomain обсуждение исходный текст |
| Ответ на | Re: Pre-allocated free space for row updating (like PCTFREE) (Satoshi Nagayasu <nagayasus@nttdata.co.jp>) |
| Список | pgsql-hackers |
On Wed, 2005-08-31 at 16:50 +0900, Satoshi Nagayasu wrote: > Simon Riggs wrote: > >>4. Allow to repair fragmentation in each page. > >> > >>Because updates cause fragmentation in the page. > >> > >>So we need to keep large continuous free space in each page, > >>if we want to get more effective on PCTFREE feature. > > > > > > ...doesn't VACUUM already do that? > > VACUUM generates a huge load because it repaires all pages > on the table file. > > I think (more light-weight) repairing on a single page > is needed to maintain free space in the specific page. So PCTFREE is an OK idea, but lets drop #4, which is a separate idea and not one that has gained agreeable consensus. Best Regards, Simon Riggs
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