Re: batch inserts are "slow"

From: Tim Terlegård <tim(at)se(dot)linux(dot)org>
To: Pawel Bernat <asm(at)asm(dot)flynet(dot)pl>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: batch inserts are "slow"
Date: 2005-05-02 15:20:07
Message-ID: Pine.LNX.4.44.0505021711050.7150-100000@naskur.se.linux.org
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> > Howdy!
> >
> > I'm converting an application to be using postgresql instead of oracle.
> > There seems to be only one issue left, batch inserts in postgresql seem
> > significant slower than in oracle. I have about 200 batch jobs, each
> > consisting of about 14 000 inserts. Each job takes 1.3 seconds in
> > postgresql and 0.25 seconds in oracle. With 200 jobs this means several
> > more minutes to complete the task. By fixing this I think the
> > application using postgresql over all would be faster than when using
> > oracle.
>
> Have you tried COPY statement?

I did that now. I copied all 3 million rows of data into a text file and
executed the COPY command. It takes about 0.25 seconds per job. So that's
much better. I'm afraid jdbc doesn't support COPY though. But now I know
what the theoretical lower limit is atleast.

Should it be possible to get anyway nearer 0.25s from my current 1.3s?

Tim

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