| From: | "Robert Haas" <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | "Mark Wong" <markwkm(at)gmail(dot)com> |
| Cc: | "Greg Smith" <gsmith(at)gregsmith(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Heikki Linnakangas" <heikki(dot)linnakangas(at)enterprisedb(dot)com>, "Gregory Stark" <stark(at)enterprisedb(dot)com>, "Josh Berkus" <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Simple postgresql.conf wizard |
| Date: | 2008-12-04 06:01:45 |
| Message-ID: | 603c8f070812032201id37d3a0l51190c207a781744@mail.gmail.com |
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| Lists: | pgsql-hackers |
>> I think the tests you could consider next is to graph the target going from
>> 10 to 100 in steps of 10 just for those 5 queries. If it gradually
>> degrades, that's interesting but hard to nail down. But if there's a sharp
>> transition, getting an explain plan for the two sides of that should provide
>> some insight. I'm really more interested in the ones that slowed down than
>> the one that improved, understanding that might finally provide some
>> evidence against increasing it by default.
>
> I've updated the charts to include results from setting
> default_statistics_target from 20-90. The links to the charts are the
> same. The links to the raw data are in
> http://207.173.203.223/~markwkm/community6/dbt3/ in directories 45-52.
I still think we're missing the boat here because it's not really the
same query every time.
...Robert
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