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Re: Postgres performance problem

From: Bill Moran <wmoran(at)collaborativefusion(dot)com>
To: Chris Mair <chris(at)1006(dot)org>
Cc: Ruben Rubio <ruben(at)rentalia(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Postgres performance problem
Date: 2007-08-27 13:29:35
Message-ID: 20070827092935.be819c94.wmoran@collaborativefusion.com (view raw or flat)
Thread:
Lists: pgsql-performance
In response to Chris Mair <chris(at)1006(dot)org>:

> > Hi,
> > 
> > Note: I have already vacumm full. It does not solve the problem.

To jump in here in Chris' defense, regular vacuum is not at all the same
as vacuum full.  Periodic vacuum is _much_ preferable to an occasional
vacuum full.

The output of vacuum verbose would have useful information ... are you
exceeding your FSM limits?

Try a reindex on the database.  There may be some obscure corner
cases where reindex makes a notable improvement in performance.

> > I have a postgres 8.1 database. In the last days I have half traffic
> > than 4 weeks ago, and resources usage is twice. The resource monitor
> > graphs also shows hight peaks (usually there is not peaks)

Resource monitor graphs?  That statement means nothing to me, therefore
I don't know if the information they're providing is useful or accurate,
or even _what_ it is.  What, exactly, are these graphs monitoring?

You might want to provide your postgresql.conf.

Have you considered the possibility that the database has simply got more
records and therefore access takes more IO and CPU?

> > The performarce is getting poor with the time.
> > 
> > Im not able to find the problem, seems there is not slow querys ( I have
> > log_min_duration_statement = 5000 right now, tomorrow I ll decrease it )
> > 
> > Server is HP, and seems there is not hardware problems detected.
> > 
> > Any ideas to debug it?
> 
> Hi,
> 
> first of all: let us know the exact version of PG and the OS.
> 
> If performance is getting worse, there ususally is some bloat
> envolved. Not vacuuming aggressivly enough, might be the most
> common cause. Do you autovacuum or vacuum manually?
> Tell us more...
> 
> 
> Bye,
> Chris.
> 
> 
> 
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> 
> 
> 
> 
> 


-- 
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran(at)collaborativefusion(dot)com
Phone: 412-422-3463x4023

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