Hi, unfortunatily, I have to work with some very large vector-layers at the moment (more than 800.000 polygons in some shape-files). I have to select features by attribute, write some selections to new layers, union features by attribute, etc. (classical GIS-tasks). That's actually no fun! Has anybody some performance-tips? What's the best data format for working with large vector-layers in OJ? I loaded a polygon-shape to a postGIS-table via shp2pgsql with a spatial index (GIST) but the loaded table doesn's show a better performance than the shape-file (PostgreSQL-Server is located on a windows-server in a local network).
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