From: "Aris Samad-Yahaya" <aris@quickschools.com>
To: "'Tom Lane'" <tgl@sss.pgh.pa.us>
Cc: <pgsql-performance@postgresql.org>
References: <008801ca6021$c1cc7630$45656290$@com>
	<18869.1257650960@sss.pgh.pa.us>
In-Reply-To: <18869.1257650960@sss.pgh.pa.us>
Subject: Re: CREATE TABLE slowing down significantly over time 
Date: Sat, 7 Nov 2009 23:58:03 -0500
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We vacuum analyze nightly, and vacuum normally ad-hoc (but we're going to
schedule this weekly moving forward).

Interesting pointer about system catalog bloat. I tried to vacuum full the
system catalog tables (pg_*), and the performance for creating a single
table manually improved dramatically (back to what it used to be), but as
soon as I created the next schema, the performance went back down to the
same level.

So there's a clue there somewhere. Next I will try to vacuum full the entire
database.

-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us] 
Sent: Saturday, November 07, 2009 10:29 PM
To: Aris Samad-Yahaya
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] CREATE TABLE slowing down significantly over time 

"Aris Samad-Yahaya" <aris@quickschools.com> writes:
> I'm facing a problem where running a CREATE TABLE has slowed down
> significantly over time.

System catalog bloat maybe?  What are your vacuuming practices?

			regards, tom lane