| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | Cédric Villemain <cedric(dot)villemain(dot)debian(at)gmail(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Florian Helmberger <fh(at)25th-floor(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [ADMIN] pg_class reltuples/relpages not updated by autovacuum/vacuum |
| Date: | 2011-05-29 15:57:01 |
| Message-ID: | 21060.1306684621@sss.pgh.pa.us |
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Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> writes:
> On Sun, May 29, 2011 at 8:10 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> That would require proof, not just suggestion. Skipping pages will
>> defeat the OS read-ahead algorithm, and so could easily cost more than
>> reading them.
> My worry is what we have right now is also based on just assumptions
> and gut feelings rather than any numbers.
So go collect some numbers.
regards, tom lane
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