[mapserver-users] slow access to PostGIS layer

[Rahkonen Jukka]

Hi,

Is the spatial index OK? There is the && bounding box query happening too, not just "select geometry from my_table".

-Jukka Rahkonen-


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Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] käyttäjän G. Allegri [giohappy at gmail.com] puolesta
Lähetetty: 28. kesäkuuta 2012 1:53
Vastaanottaja: mapserver-users at lists.osgeo.org
Aihe: [mapserver-users] slow access to PostGIS layer

[cross posting from MS4W ml]

I'm working on a Windows 7 machine with PostGIS 1.5 on Postgresql 8.4, with no tuning (default configuration).

I'm facing very bad performances when accessing a polygonal layer on PostGIS.
The layer is not that heavy and complex. It is made by 20 polygons with about 4000 to 56000 vertices.

The raw query (SELECT the_geom FROM mytable), performed through the psql console, fetches the results in about 185 ms.
Logging the layer with DEBUG 5 shows that iterating over the features takes about 7.5 s.
The time between consecutive msPostGISLayerNextShape calls is about 0.3/0.4 s.
Here is the log file: http://www.giovanniallegri.it/share/mspglog.txt

I obtain the same performances with ms4w 3.0.6(MapServer MapScript to 6.0.3) and 3.0.4_dev (MapServer and MapScript 6.1-dev), which
PostGIS is 1.5 on Postgresql 8.4, with no customized options.
I'm working on a Windows 7 machine, but the work should be deployed on a Windows Server 2003.

I'm not using connection pooling, but I was facing similar performances before disabling it.
giovanni