[postgis-users] Why PostGIS ST_Intersection much slower than ArcGIS Intersect ?
etienne.desgagne at roche.ca
Wed Nov 28 13:22:54 PST 2012
I don't want to denigrate PostGIS in any way and I know that my
comparison may be wrong but I'm trying to understand why a basic
ST_Intersection of two relatively small layers (< 1000 polygons) take about
1m40 sec in PostGIS(2.0 on PG 9.2 on Windows) while applying the ArcGIS
Intersect on same layers and machine take about 2 sec?
I'm aware of some PostgreSQL tuning settings but even applying basic tuning
recommendation for PostGIS I'm facing the same problem...
My two layers also have a spatial index.
Is it normal behavior? Any suggestion for reaching better performance?
Note that I'm also using ST_Intersects on the join to filter only
Thanks a lot
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the postgis-users