On Wed, 2002-05-22 at 09:19, Tom Sheehan wrote:
> Have you looked at the COPY command is psql for this? There are the, 'FROM
> { 'filename' | stdin } and [ [USING] DELIMITERS] clauses that may be of use.
> It seems to me that bulk loading is what they were designed for.
It doesn't handle csv files where there are double-quotes
around each field. Also, it runs it 1 big transaction,
and if it fails, you must load the whole thing over again...
From the mailing list archives, I see where COPY was only
designed for db_dump, but has had a few features added to
it. It was not designed to be a full-featured bulk loader/unloader.
> ----- Original Message -----
> From: "Ron Johnson" <ron.l.johnson@cox.net>
> To: "PgSQL Novice ML" <pgsql-novice@postgresql.org>
> Sent: Tuesday, May 21, 2002 3:40 PM
> Subject: [NOVICE] Better way to bulk-load millions of CSV records into
> postgres?
>
>
> >
> > Hi,
> >
> > Currently, I've got a python script using pyPgSQL that
> > parses the CSV record, creates a string that is a big
> > "INSERT INTO VALUES (...)" command, then, execute() it.
> >
> > top shows that this method uses postmaster with ~70% CPU
> > utilization, and python with ~15% utilization.
> >
> > Still, it's only inserting ~190 recs/second. Is there a
> > better way to do this, or am I constrained by the hardware?
> >
> > Instead of python and postmaster having to do a ton of data
> > xfer over sockets, I'm wondering if there's a way to send a
> > large number of csv records (4000, for example) in one big
> > chunk to a stored procedure and have the engine process it
> > all.
> >
> > Linux 2.4.18
> > PostgreSQL 7.2.1
> > python 2.1.3
> > csv file on /dev/hda
> > table on /dev/hde (ATA/100)
--
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| Ron Johnson, Jr. Home: ron.l.johnson@cox.net |
| Jefferson, LA USA http://ronandheather.dhs.org:81 |
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| "I have created a government of whirled peas..." |
| Maharishi Mahesh Yogi, 12-May-2002, |
! CNN, Larry King Live |
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