Should autovacuum do a database wide vacuum near transaction limit?

From: "John Lister" <john(dot)lister-ps(at)kickstone(dot)com>
To: <pgsql-admin(at)postgresql(dot)org>
Subject: Should autovacuum do a database wide vacuum near transaction limit?
Date: 2011-01-21 21:48:24
Message-ID: 927BF3A3F54247FF8C63219A00CE98B5@squarepi.com
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Hi, I'm running 8.3.9 on ubuntu with autovacuum enabled and seemingly working properly., however I've started getting messages saying that I'm near the transaction limit and I need to do a database wide vacuum, which I've started.

From reading the docs, though I thought that autovacuum would do this on my behalf, is this true? I would have expected it to run before I started getting warnings, or does it wait until the warnings start? If not, is there any config setting or other reason why autovacuum isn't doing a database wide vacuum as expected or do I always need to do a manual one?

Thanks

John

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