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From: Scott Marlowe <scott.marlowe@gmail.com>
To: Phoenix Kiula <phoenix.kiula@gmail.com>
Cc: Bill Moran <wmoran@collaborativefusion.com>
Cc: PG-General Mailing List <pgsql-general@postgresql.org>
Subject: Re: Dumping/Restoring with constraints?
Date: Wed, 27 Aug 2008 11:41:56 -0600
Message-ID: <dcc563d10808271041n5e5c4d0exedba194893a58de6@mail.gmail.com> (raw)
In-Reply-To: <e373d31e0808270740u38873cccx32b24796f02438e6@mail.gmail.com>
References: <e373d31e0808270619uba31c8eodc2c85662b85140a@mail.gmail.com>
	<22708.1219845242@sss.pgh.pa.us>
	<e373d31e0808270712n7c599a82sca5a6bbf6cc5c20a@mail.gmail.com>
	<20080827102403.dc69c802.wmoran@collaborativefusion.com>
	<e373d31e0808270726x2deb251an5d875ebbadc6149f@mail.gmail.com>
	<20080827103429.081e93a1.wmoran@collaborativefusion.com>
	<e373d31e0808270740u38873cccx32b24796f02438e6@mail.gmail.com>

On Wed, Aug 27, 2008 at 8:40 AM, Phoenix Kiula <phoenix.kiula@gmail.com> wrote:
> Thanks. But there seems to be a tangible slowdown of DB operations
> during the time that pg_dump is running. Perhaps some of my
> postgresql.conf variables are not geared to this. (I vaguely recall
> setting it up so that the wal_buffers or checkpoint_segments needed to
> be set upwards for maintenance tasks).
>
> My question: is it possible to interactively set up these variables so
> that pg_dumpall can work very fast? And behind the scenes, without
> slowing stuff down?

Nope, it's not a software problem, it's a hardware problem.  You're
drive subsystem can only deliver data so fast.  The fix is usually
better hardware.  Big RAID controller and lots of drives.



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