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Date: Fri, 18 Dec 1998 16:41:40 +0700
From: Vadim Mikheev <vadim@krs.ru>
Organization: OJSC Rostelecom (Krasnoyarsk)
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To: Anton de Wet <adw@obsidian.co.za>
CC: pgsql-general@postgreSQL.org
Subject: Re: [GENERAL] Why PostgreSQL is better than other commerial softwares?
References: <Pine.LNX.4.04.9812181046030.9458-100000@ra.obsidian.co.za>
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Anton de Wet wrote:
>
> >
> > Often quick mailing list support?
>
> :-)
>
> While on the subject I finally found the solution to a problem I (and one
> or two other people) posted about without answer. (So sometimes it's slow
> mailing list support).
>
> In importing about 5 million records (which I copy in blocks of 10000) the
> copy became linearly slower. After a friend RTFM and refered me, I used
> the -F switch (passed by the postmaster to the backend processes) and the
> time became linear and a LOT shorter. Import time for the 5000000 records
> now the same (or maybe even slightly faster, I didn't accurately time
> them) as importing the data into oracle on the same machine.
"While on the subject..." -:)
This is the problem of buffer manager, known for very long time:
when copy eats all buffers, manager begins write/fsync each
durty buffer to free buffer for new data. All updated relations
should be fsynced _once_ @ transaction commit. You would get
the same results without -F...
I still have no time to implement this -:(
Vadim
