On 26/02/09 08:56, Vincent Bain wrote:
Hello, reading this thread, and being sometimes concerned with large vector files (associated with big related tables), I wonder if it's worth manually creating indexes (on cat field) : can it be a effective way to speed up queries, or is the kink elsewhere, at the geometric level (data handled by grass, not the linked DBMS) ?
AFAIK, an index on the cat field is created automatically when a new vector is created, but if you link an existing table to a vector map, no indices are created. So, yes, creating an index on your cat field can make a significant difference for operations involving that field...
Moritz _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev
