Re: Question on REINDEX
От | Josh Berkus |
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Тема | Re: Question on REINDEX |
Дата | |
Msg-id | 200504191056.16688.josh@agliodbs.com обсуждение исходный текст |
Ответ на | Re: Question on REINDEX (Tom Lane <tgl@sss.pgh.pa.us>) |
Ответы |
Re: Question on REINDEX
|
Список | pgsql-performance |
Tom, > Not at all. What it says is that you expect 100% of the pages to have > useful amounts of free space, which is a *much* weaker criterion. Hmmm. Good point. This seems to be another instance where my rule-of-thumb was based on false logic but nevertheless arrived at correct numbers. I've seldom, if ever, set FSM_pages above 50% of the pages in the active database ... and never run out. Hmmmm .... actually, it seems like, if you are vacuuming regularly, you only *do* need to track pages that have been touched by DELETE or UPDATE. Other pages would have already been vacuumed and not have any useful free space left. Yes? -- --Josh Josh Berkus Aglio Database Solutions San Francisco
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