Paul, Did you ANALYZE the new database after you upgraded it to 2.1.0? Try that and rerun your query and see if that helps.
-Steve On 12/10/2013 10:46 AM, Moen, Paul T. wrote:
I have a table of multilines that the query below slows down considerably after upgrading to postgis 2.1.0. I am running the following Postgis. "POSTGIS="2.0.3 r11128" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.10.1, released 2013/08/26" LIBXML="2.7.3" LIBJSON="UNKNOWN" TOPOLOGY RASTER" Below is a query that is created by Mapserver 6.0.3 that I am running in pgAdmin. -- Executing query: select "flow_type","feat_type",encode(ST_AsBinary(ST_Force_2D("the_geom"),'NDR'),'hex') as geom,"gid" from basemap.water24k_line where the_geom && ST_GeomFromText('POLYGON((1564746.75408708 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708 903581.471987315))',2266) Total query runtime: 569 ms. 344 rows retrieved. After upgrading to Postgis 2.1.0, "POSTGIS="2.1.0 r11822" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.10.1, released 2013/08/26" LIBXML="2.7.3" LIBJSON="UNKNOWN" TOPOLOGY RASTER" the same query takes over 10 times the time. -- Executing query: select "flow_type","feat_type",encode(ST_AsBinary(ST_Force_2D("the_geom"),'NDR'),'hex') as geom,"gid" from basemap.water24k_line where the_geom && ST_GeomFromText('POLYGON((1564746.75408708 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708 903581.471987315))',2266); --select postgis_full_version(); --alter extension postgis_topology update to '2.1.0'; WARNING: ST_Force_2d signature was deprecated in 2.1.0. Please use ST_Force2D CONTEXT: SQL function "st_force_2d" during startup Total query runtime: 6202 ms. 344 rows retrieved. Changing ST_Force_2D to ST_Force2D helped quite a bit, but it is still twice as slow as Postgis 2.0.3. -- Executing query: select "flow_type","feat_type",encode(ST_AsBinary(ST_Force2D("the_geom"),'NDR'),'hex') as geom,"gid" from basemap.water24k_line where the_geom && ST_GeomFromText('POLYGON((1564746.75408708 903581.471987315,1564746.75408708 938518.971987315,1599744.49115605 938518.971987315,1599744.49115605 903581.471987315,1564746.75408708 903581.471987315))',2266); --select postgis_full_version(); --alter extension postgis_topology update to '2.1.0'; Total query runtime: 1029 ms. 344 rows retrieved. Is performance hit expected? Thanks for any insight, Paul _______________________________________________ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
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