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70 lines
2.9 KiB
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From owner-pgsql-general@hub.org Fri Dec 18 06:31:23 1998
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Fri, 18 Dec 1998 16:41:44 +0700 (KRS)
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(envelope-from vadim@krs.ru)
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Message-ID: <367A2354.E998763@krs.ru>
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Date: Fri, 18 Dec 1998 16:41:40 +0700
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From: Vadim Mikheev <vadim@krs.ru>
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Organization: OJSC Rostelecom (Krasnoyarsk)
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X-Accept-Language: ru, en
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MIME-Version: 1.0
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To: Anton de Wet <adw@obsidian.co.za>
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CC: pgsql-general@postgreSQL.org
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Subject: Re: [GENERAL] Why PostgreSQL is better than other commerial softwares?
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References: <Pine.LNX.4.04.9812181046030.9458-100000@ra.obsidian.co.za>
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Sender: owner-pgsql-general@postgreSQL.org
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Precedence: bulk
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Status: RO
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Anton de Wet wrote:
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>
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> >
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> > Often quick mailing list support?
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>
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> :-)
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>
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> While on the subject I finally found the solution to a problem I (and one
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> or two other people) posted about without answer. (So sometimes it's slow
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> mailing list support).
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>
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> In importing about 5 million records (which I copy in blocks of 10000) the
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> copy became linearly slower. After a friend RTFM and refered me, I used
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> the -F switch (passed by the postmaster to the backend processes) and the
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> time became linear and a LOT shorter. Import time for the 5000000 records
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> now the same (or maybe even slightly faster, I didn't accurately time
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> them) as importing the data into oracle on the same machine.
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"While on the subject..." -:)
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This is the problem of buffer manager, known for very long time:
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when copy eats all buffers, manager begins write/fsync each
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durty buffer to free buffer for new data. All updated relations
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should be fsynced _once_ @ transaction commit. You would get
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the same results without -F...
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I still have no time to implement this -:(
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Vadim
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