From: Sven Willenberger <sven@dmv.com>
To: Oliver Crosby <ryusei@gmail.com>
Cc: Dawid Kuroczko <qnex42@gmail.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: jd@commandprompt.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Looking for tips
Date: Tue, 19 Jul 2005 16:46:01 -0400
Message-ID: <1121805961.3674.25.camel@lanshark.dmv.com> (raw)
In-Reply-To: <1efd553a050719132836c31b78@mail.gmail.com>
References: <s2dd0700.023@gwmta.wicourts.gov>
<1efd553a0507191308219a098b@mail.gmail.com>
<758d5e7f0507191319636afaa3@mail.gmail.com>
<1efd553a050719132836c31b78@mail.gmail.com>
On Tue, 2005-07-19 at 16:28 -0400, Oliver Crosby wrote:
> > If it is possible try:
> > 1) wrapping many inserts into one transaction
> > (BEGIN;INSERT;INSERT;...INSERT;COMMIT;). As PostgreSQL will need to
> > handle less transactions per second (each your insert is a transaction), it
> > may work faster.
>
> Aye, that's what I have it doing right now. The transactions do save a
> HUGE chunk of time. (Cuts it down by about 40%).
>
> > 2) If you can do 1, you could go further and use a COPY command which is
> > the fastest way to bulk-load a database.
>
> I don't think I can use COPY in my case because I need to do
> processing on a per-line basis, and I need to check if the item I want
> to insert is already there, and if it is, I need to get it's ID so I
> can use that for further processing.
>
since triggers work with COPY, you could probably write a trigger that
looks for this condition and does the ID processsing you need; you could
thereby enjoy the enormous speed gain resulting from COPY and maintain
your data continuity.
Sven
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Cc: sven@dmv.com, ryusei@gmail.com, qnex42@gmail.com, Kevin.Grittner@wicourts.gov, jd@commandprompt.com
Subject: Re: Looking for tips
In-Reply-To: <1121805961.3674.25.camel@lanshark.dmv.com>
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