To: femski <hypertree@yahoo.com>
cc: pgsql-performance@postgresql.org
Subject: Re: Postgres batch write very slow - what to do 
In-reply-to: <9453712.post@talk.nabble.com> 
References: <9452092.post@talk.nabble.com> <45F685B7.5040001@enterprisedb.com>
	<9453712.post@talk.nabble.com>
Comments: In-reply-to femski <hypertree@yahoo.com>
	message dated "Tue, 13 Mar 2007 05:56:23 -0700"
Date: Tue, 13 Mar 2007 11:29:09 -0400
Message-ID: <2563.1173799749@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>

femski <hypertree@yahoo.com> writes:
> I am runing Postgres 8.2 on OpenSuse 10.2 with latest jdbc driver. I moved
> the app to be collocated with the server. Oracle takes 60 sec. Postgres 275
> sec. For 4.7 million rows.

> There are 4 CPUs on the server and one is runing close to 100% during
> inserts.
> Network history shows spikes of upto 60% of the bandwidth (Gnome System
> monitor graph).

It sounds like you're incurring a network round trip for each row, which
will be expensive even for a co-located application.  Perhaps Oracle's
JDBC driver is smart enough to avoid that.  I'm not sure what tricks are
available for bulk loading with our JDBC driver --- the page Heikki
mentioned explains things from a server perspective but I dunno how that
translates into JDBC.  The folks who hang out on pgsql-jdbc could
probably give you some tips.

			regards, tom lane