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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Richard Yen <richyen@iparadigms.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Scott Marlowe <scott.marlowe@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: [Slony1-general] WAL partition overloaded--by autovacuum?
Date: Thu, 08 Jul 2010 15:50:33 -0400
Message-ID: <784.1278618633@sss.pgh.pa.us> (raw)
In-Reply-To: <855D47FE-2386-4933-BED3-55FE2BA42CC0@iparadigms.com>
References: <03D2C5F0-F222-4088-B5E4-8DA688565B70@iparadigms.com>
	<AANLkTik1oR2fMBp9pzpeYUgrANXKpK0B23scXONQEK1z@mail.gmail.com>
	<78E79F0B-5C6C-4BDA-B69C-C0FBF69ABBC7@iparadigms.com>
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	<4C35DADF020000250003326D@gw.wicourts.gov>
	<855D47FE-2386-4933-BED3-55FE2BA42CC0@iparadigms.com>

Richard Yen <richyen@iparadigms.com> writes:
> My concern is that--as in the original post--there were moments where 129 WAL files were generated in one minute.  Is it plausible that this autovacuum could be responsible for this?

That's not a particularly surprising WAL creation rate for a busy
database.  I wouldn't expect autovacuum to cause it by itself, but
that's true only because autovacuum processing is typically throttled
by autovacuum_vacuum_cost_delay.  Perhaps you had that set to zero?

			regards, tom lane



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