| From: | "Tomas Vondra" <tv(at)fuzzy(dot)cz> |
|---|---|
| To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Tomas Vondra" <tv(at)fuzzy(dot)cz>, "Mark Kirkwood" <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>, "Andres Freund" <andres(at)2ndquadrant(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: 60 core performance with 9.3 |
| Date: | 2014-07-30 12:47:23 |
| Message-ID: | 11b808bce5fce4547fdcac5e94acb440.squirrel@sq.gransy.com |
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| Lists: | pgsql-performance |
On 30 Červenec 2014, 14:39, Tom Lane wrote:
> "Tomas Vondra" <tv(at)fuzzy(dot)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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