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From: Tomas Vondra <tv@fuzzy.cz>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Tomas Vondra <tv@fuzzy.cz>
Cc: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Cc: Andres Freund <andres@2ndquadrant.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: 60 core performance with 9.3
Date: Wed, 30 Jul 2014 14:47:23 +0200
Message-ID: <11b808bce5fce4547fdcac5e94acb440.squirrel@sq.gransy.com> (raw)
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On 30 Červenec 2014, 14:39, Tom Lane wrote:
> "Tomas Vondra" <tv@fuzzy.cz> writes:
>> On 30 ??ervenec 2014, 3:44, Mark Kirkwood wrote:
>>> While these numbers look great in the middle range (12-96 clients),
>>> then
>>> benefit looks to be tailing off as client numbers increase. Also
>>> running
>>> with no stats (and hence no auto vacuum or analyze) is way too scary!
>
>> By disabling statistics collector you loose runtime counters - number of
>> sequential/index scans on a table, tuples read from a relation aetc. But
>> it does not influence VACUUM or planning at all.
>
> It does break autovacuum.

Of course, you're right. It throws away info about how much data was
modified and when the table was last (auto)vacuumed.

This is a clear proof that I really need to drink at least one cup of
coffee in the morning before doing anything in the morning.

Tomas



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