On Fri, 17 Mar 2006, Evgeny Gridasov wrote:
Try contrib/btree_gist.
contrib/btree_gist does nothing more than built-in btree - it's just
an support for multicolumn GiST indices.
I've tried that one, but for my case it didn't help much.
The performance was almost equal or even slower than built-in btree.
On Fri, 17 Mar 2006 08:53:44 -0700
Dan Harris <fbsd@xxxxxxxxxxxxxxx> wrote:
Dan Harris wrote:
Markus Bertheau wrote:
Have you tried using a GIST index on lat & long? These things are
meant for two-dimensional data, whereas btree doesn't handle
two-dimensional data that well. How many rows satisfy either of the
long / lat condition?
According to the analyze, less than 500 rows matched. I'll look into
GIST indexes, thanks for the feedback.
-Dan
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When I try to create a GIST index, I get the following error:
create index eventgeo_lat_idx on eventgeo using GIST (lat);
ERROR: data type double precision has no default operator class for
access method "gist"
HINT: You must specify an operator class for the index or define a
default operator class for the data type.
I'm not sure what a "default operator class" is, exactly..
-Dan
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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
