Re: Measuring relation free space
| От | Jaime Casanova |
|---|---|
| Тема | Re: Measuring relation free space |
| Дата | |
| Msg-id | CAJKUy5jzVzt1097v2u_Jk0PuLdgSf3p12WOpXBCKPSw=Gach_w@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Measuring relation free space (Noah Misch <noah@leadboat.com>) |
| Ответы |
Re: Measuring relation free space
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| Список | pgsql-hackers |
On Wed, Jan 18, 2012 at 7:01 PM, Noah Misch <noah@leadboat.com> wrote: > On Wed, Jan 18, 2012 at 09:46:20AM -0500, Jaime Casanova wrote: >> >> ignoring all non-leaf pages still gives a considerable difference >> between pgstattuple and relation_free_space() > > pgstattuple() counts the single B-tree meta page as always-full, while > relation_free_space() skips it for all purposes. For tiny indexes, that can > shift the percentage dramatically. > ok, i will reformulate the question. why is fine ignoring non-leaf pages but is not fine to ignore the meta page? -- Jaime Casanova www.2ndQuadrant.com Professional PostgreSQL: Soporte 24x7 y capacitación
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