On Tue, 5 Sep 2006, Nick Bower wrote:
Thanks - but what do you call big?
Several billions of stars. You can try our Cone Search service at
http://vo.astronet.ru/cas/conesearch.php
Oleg
My application is satellite data btw so the reference could be useful.
On Tue, 5 Sep 2006 01:40 pm, Oleg Bartunov wrote:
Nick,
if you need very fast spatial queries (spherical) you may use our
Q3C module for POstgreSQL (q3c.sf.net). We use it for providing access
to very big astronomical catalogs.
Oleg
On Tue, 5 Sep 2006, Nick Bower wrote:
We're considering using Postgresql for storing gridded metadata - each
point of our grids has a variety of metadata attached to it (including
lat/lon, measurements, etc) and would constitute a record in
Postgresql+Postgis.
Size-wise, grids are about 4000x700 and are collected twice daily over
say 10 years. As mentioned, each record would have up to 50 metadata
attributes (columns) including geom, floats, varchars etc.
So given 4000x700x2x365x10 > 2 billion, is this going to be a problem if
we will be wanting to query on datetimes, Postgis lat/lon, and
integer-based metadata flags?
If however I'm forced to sub-sample the grid, what rule of thumb should I
be looking to be constrained by?
Thanks for any pointers, Nick
PS - Feel free to throw in any other ideas of grid-suitable databases :)
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
