It is slow.
EXPLAIN VERBOSE:
"Nested Loop (cost=0.00..99912244399.51 rows=520868 width=37)"
" Output: a.point_id, b.polygon_id"
" Join Filter: ((st_setsrid(st_geomfromwkb(st_asbinary(b.geog)), 4326) &&
st_setsrid(st_geomfromwkb(st_asbinary(a.geog)), 4326)) AND
_st_contains(st_setsrid(st_geomfromwkb(st_asbinary(b.geog)), 4326),
st_setsrid(st_geomfromwkb(st_asbinary(a.geog)), 4326)))"
" -> Seq Scan on points b (cost=0.00..22058.03 rows=288003 width=2135)"
" Output: b.polygon_id, b.geog"
" -> Seq Scan on polygons a (cost=0.00..29513.30 rows=1085130 width=138)"
" Output: a.point_id, a.geog"
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Szymon Guz
Sent: Wednesday, October 19, 2011 12:28 PM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Speed up query
On 19 October 2011 18:21, Gheorghiu, Mihai
<mgheorg...@chpmail.com<mailto:mgheorg...@chpmail.com>> wrote:
I have a query that places points in polygons:
insert into results (
select a.point_id, b.polygon_id
from points a, polygons b
where
st_contains(ST_GeomFromWKB(ST_AsBinary(b.geog),4326),ST_GeomFromWKB(ST_AsBinary(a.geog),4326))
= 't'
);
There are ~1M points and ~300k polygons. There are geo indexes on the geog
columns of both tables.
What changes would make the query faster?
Thank you very much.
Michael
... and the problem is?
Especially I'd like to know is the time, show us explain analyze of the query
and show table structures.
regards
Szymon
--
http://simononsoftware.com/
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