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Re: how to plan for vacuum?

From: Ray Stell <stellr(at)cns(dot)vt(dot)edu>
To: Galy Lee <lee(dot)galy(at)oss(dot)ntt(dot)co(dot)jp>
Cc: pgsql-performance(at)postgresql(dot)org, jim(at)nasby(dot)net
Subject: Re: how to plan for vacuum?
Date: 2007-01-25 13:47:03
Message-ID: 20070125134703.GA7869@cns.vt.edu (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
On Thu, Jan 25, 2007 at 07:29:20PM +0900, Galy Lee wrote:
> so what is the principle to set them?
>  - keep dead space lower than some disk limit
>  - or keep the garbage rate lower than fillfactor
>  or any other general principle?


How do you measure "dead space" and "garbage rate?"

I'm a newbe, I don't even know what these terms mean, but if I can measure
them, perhaps it will gel, and really if you can't measure the effect
of a setting change, what have you got?  I would hope any discussion on
autovac parms would include some metric evaluation techniques.  Thanks.

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