Re: How to optimize insert statements ?

Hello Tom,

Thanks for your reply and advise. I understand in your email that the
use of a sequence object will increase the performance of my trigger.
Therefore I'm going to replace that in my code immediately. Anyway, my
problem is not exactly the performances; it's more the insertion time
growing. Indeed I don't understand why the insertion time grows
"exponentially" with my single transaction. If I split my objects
insertion into several transactions (instead of one), the problem seems
to disappear. Would you see any reasons linked to the Postgres
transactions explaining this insertion time growing ?

Regards,
Christian


-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Tuesday, July 24, 2007 4:33 PM
To: Christian Leclerc
Cc: pgsql-novice@postgresql.org
Subject: Re: [NOVICE] How to optimize insert statements ?

"Christian Leclerc" <cleclerc@ilog.fr> writes:
> I'm encountering a performance issue with insert statements.

It looks to me like your trigger is the entire cause of the slowness.
I think you would be well advised to get rid of it and use a serial
column (ie a sequence object) instead of a handmade, poorly performing
substitute for sequences.

            regards, tom lane