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Re: How to determine cause of performance problem?

From: Joost Kraaijeveld <J(dot)Kraaijeveld(at)Askesis(dot)nl>
To: Michael Stone <mstone+postgres(at)mathom(dot)us>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: How to determine cause of performance problem?
Date: 2005-09-23 10:21:15
Message-ID: 1127470875.3524.17.camel@Panoramix (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Fri, 2005-09-23 at 05:55 -0400, Michael Stone wrote:
> It's not clear what your object id generator does. If it's just a
> sequence, it's not clear that you need this program at all--just use a
> SELECT INTO and make the object id a SERIAL.
It generates a GUID (and no, I do not want to turn this in a discussion
about GUIDs). As in the Java code comment: it is not the generation of
the GUID that is the problem (that is, I can generate millions of them
per second.)

> If you do need to control the object id or do some other processing
> before putting the data into the new table, rewrite to use a COPY
> instead of an INSERT.
It is actually the shortest piece of code that gives me a poor
performance. The conversion problem is much, much larger and much much
more complicated. 

I suspect that either my hardware is to slow (but then again, see the
specs), or my Debian is to slow, or my PostgreSQL settings are wrong.

But I have no clue where to begin with determining the bottleneck (it
even may be a normal performance for all I know: I have no experience
with converting such (large) database).

Any suggestions?


Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
e-mail: J(dot)Kraaijeveld(at)Askesis(dot)nl

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