I guess more better is to use this extremely simple batch and create all the index in one step only. sing the gdal/ogr from osgeo4w.
http://trac.osgeo.org/gdal/wiki/BatchCreationIndexesForShapefilesOnDOS Regards, 2014-02-27 10:47 GMT+01:00 kimaidou <[email protected]>: > Hi list, > > I have some concerns about spatial indexes in QGIS. Spatial indexes are > very usefull, and for me rather mandatory as soon as you deal with more > than 100 features. > > > I would like to share some ideas about them : > > 1) Extend QGIS so that it can create spatial indexes for more vector > format. If I am correct, for now only Shapefiles and Database vector layers > can have a spatial index created by QGIS . Why not for GeoJson, CSV files, > etc ? > > 2) If possible, create a spatial index for each vector layer added to the > canvas if no one is already present. Since it is a quite fast operation, > the small time needed is worth it. > > 3) If possible, update the spatial index (replace the old qix by a new > one) every time the vector layer is updated. No need to do so for database > layers, but this can be very usefull for big shapefiles. I have seen some > people creating a spatial index, then as time passes, they add more and > more data into the shapefile but forget to update the spatial index. > Sometimes this can lead to some data not displayed in QGIS because QGIs > seems to rely on the outdatedSpatial index. > > For me, using spatial indexes is like brushing my teeth : I do it very > often without even thinking of it. But many users do not know that spatial > indexes exists, or do it but forget to use them as needed. I really think > QGIS should help them to improve perfs in the background. > > Regards > Michael > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer > -- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù -----------------
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