From: Tom Lane <tgl@sss.pgh.pa.us>
To: Erik Jones <erik@myemma.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Slow dump?
Date: Tue, 02 Jan 2007 12:30:24 -0500
Message-ID: <5876.1167759024@sss.pgh.pa.us> (raw)
In-Reply-To: <459A8B51.8000906@myemma.com>
References: <459A8B51.8000906@myemma.com>
Erik Jones <erik@myemma.com> writes:
> Hello, we recently migrated our system from 8.1.x to 8.2 and when
> running dumps have noticed an extreme decrease in speed where the dump
> is concerned (by more than a factor of 2).
That's odd. pg_dump is normally pretty much I/O bound, at least
assuming your tables are sizable. The only way it wouldn't be is if you
have a datatype with a very slow output converter. Have you looked into
exactly which tables are slow to dump and what datatypes they contain?
(Running pg_dump with log_min_duration_statement enabled would provide
useful data about which steps take a long time, if you're not sure.)
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, erik@myemma.com
Subject: Re: Slow dump?
In-Reply-To: <5876.1167759024@sss.pgh.pa.us>
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