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Re: [HACKERS] More detail on settings for pgavd?

From: Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>
To: "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
Cc: Josh Berkus <josh(at)agliodbs(dot)com>,Shridhar Daithankar <shridhar_daithankar(at)myrealbox(dot)com>,pgsql-performance(at)postgresql(dot)org,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] More detail on settings for pgavd?
Date: 2003-11-21 14:14:14
Message-ID: 1069424054.29672.12462.camel@camel (view raw, whole thread or download thread mbox)
Lists: pgsql-hackerspgsql-performance
On Thu, 2003-11-20 at 19:40, Matthew T. O'Connor wrote:
> I'm open to discussion on changing the defaults.  Perhaps what it would 
> be better to use some non-linear (perhaps logorithmic) scaling factor.  
> So that you wound up with something roughly like this:
> #tuples   activity% for vacuum
> 1k           100%
> 10k           70%
> 100k         45%
> 1M            20%
> 10M          10%
> 100M          8%

Just thinking out loud here, so disregard if you think its chaff but...
if we had a system table pg_avd_defaults that held what we generally
consider the best default percentages based on reltuples/pages, and
added a column to pg_class (could be some place better but..) which
could hold an overriding percentage, you could then have a column added
to pg_stat_all_tables called vacuum_percentage, which would be a
coalesce of the override percentage or the default percentages based on
rel_tuples (or rel_pages).  This would give autovacuum a place to look
for each table as to when it should vacuum, and gives administrators the
option to tweak it on a per table basis if they find they need a
specific table to vacuum at a different rate than the "standard".   

Robert Treat
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL

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