| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> |
| Cc: | Michael Fuhr <mike(at)fuhr(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dan Harris <fbsd(at)drivefaster(dot)net>, PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Help optimizing a slow index scan |
| Date: | 2006-03-18 15:00:19 |
| Message-ID: | 20060318150019.GA8398@wolff.to |
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| Lists: | pgsql-performance |
On Sat, Mar 18, 2006 at 11:50:48 +0300,
Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> wrote:
> I may be wrong but we in astronomy have several sky indexing schemes, which
> allows to effectively use classical btree index. See
> http://www.sai.msu.su/~megera/oddmuse/index.cgi/SkyPixelization
> for details. Sergei Koposov has developed Q3C contrib module for
> PostgreSQL 8.1+ and we use it with billiard size astronomical catalogs.
Note that Earth Distance can also be used for astronomy. If you use an
appropiate radius, distances will be in degrees.
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