Re: autovacuum default parameters (was Re: 8.2 is 30% better in pgbench than 8.3)

From: ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: autovacuum default parameters (was Re: 8.2 is 30% better in pgbench than 8.3)
Date: 2007-07-24 05:00:43
Message-ID: 20070724135150.8E20.ITAGAKI.TAKAHIRO@oss.ntt.co.jp
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Alvaro Herrera <alvherre(at)commandprompt(dot)com> wrote:

> We didn't, but while I agree with the idea, I think 5% is too low. I
> don't want autovacuum to get excessively aggressive. Is 10% not enough?

I think the threshold should be a little less than PCTFREE of indexes,
to avoid splitting of btree leaves. It might be good to decrease the
fillfactor to 85% or so when we choise 10% for it.

Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center

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