Re: How to optimize insert statements ?

["Christian Leclerc" <cleclerc(at)ilog(dot)fr>]

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(at)sss(dot)pgh(dot)pa(dot)us] 
Sent: Tuesday, July 24, 2007 4:33 PM
To: Christian Leclerc
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: [NOVICE] How to optimize insert statements ? 

"Christian Leclerc" <cleclerc(at)ilog(dot)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