| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jan Wieck <JanWieck(at)Yahoo(dot)com> |
| Cc: | shridhar_daithankar(at)persistent(dot)co(dot)in, pgsql-general(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] Buglist |
| Date: | 2003-08-22 16:56:01 |
| Message-ID: | 17149.1061571361@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers |
Jan Wieck <JanWieck(at)Yahoo(dot)com> writes:
> Okay, my proposal would be to have a VACUUM mode where it tells the
> buffer manager to only return a page if it is already in memory, and
> some "not cached" if it would have to read it from disk, and simply skip
> the page in that case.
Since no such call is available at the OS level, this would only work
well with very large shared_buffers settings (ie, you try to rely on
PG shared buffers to the exclusion of kernel disk cache). AFAIK the
general consensus is that that's not a good way to run Postgres.
regards, tom lane
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