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Date: Wed, 30 Jul 2014 14:47:23 +0200
Subject: Re: 60 core performance with 9.3
From: "Tomas Vondra" <tv@fuzzy.cz>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: "Tomas Vondra" <tv@fuzzy.cz>,
 "Mark Kirkwood" <mark.kirkwood@catalyst.net.nz>,
 "Andres Freund" <andres@2ndquadrant.com>, pgsql-performance@postgresql.org
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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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