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Re: Performance of pg_dump on PGSQL 8.0

From: "John Vincent" <pgsql-performance(at)lusis(dot)org>
To: "Scott Marlowe" <smarlowe(at)g2switchworks(dot)com>
Cc: "PGSQL Performance" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Performance of pg_dump on PGSQL 8.0
Date: 2006-06-14 18:11:19
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Out of curiosity, does anyone have any idea what the ratio of actual
datasize to backup size is if I use the custom format with -Z 0 compression
or the tar format?


On 6/14/06, Scott Marlowe <smarlowe(at)g2switchworks(dot)com> wrote:
> On Wed, 2006-06-14 at 09:47, John E. Vincent wrote:
> > -- this is the third time I've tried sending this and I never saw it get
> > through to the list. Sorry if multiple copies show up.
> >
> > Hi all,
> > work_mem = 1048576 ( I know this is high but you should see some of our
> > sorts and aggregates)
> Ummm.  That's REALLY high.  You might want to consider lowering the
> global value here, and then crank it up on a case by case basis, like
> during nighttime report generation.  Just one or two queries could
> theoretically run your machine out of memory right now.  Just put a "set
> work_mem=1000000" in your script before the big query runs.
> > We're inserting around 3mil rows a night if you count staging, info, dim
> > and fact tables. The vacuum issue is a whole other problem but right now
> > I'm concerned about just the backup on the current hardware.
> >
> > I've got some space to burn so I could go to an uncompressed backup and
> > compress it later during the day.
> That's exactly what we do.  We just do a normal backup, and have a
> script that gzips anything in the backup directory that doesn't end in
> .gz...  If you've got space to burn, as you say, then use it at least a
> few days to see how it affects backup speeds.
> Seeing as how you're CPU bound, most likely the problem is just the
> compressed backup.

John E. Vincent

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