Hi On Mon, Mar 14, 2011 at 3:21 PM, Windmuller, H (Hans) <[email protected]> wrote: > LS, > > We are using Quantum GIS for our wardens. I have a question of which I don't > know where I can put it so I'm hoping one of you can get me into the right > direction. > > On our clients we have Windows XP sp2 as Operating System and on our > fileservers we have Microsoft Server 2003 as Operating System. > We store our data files (shape files and raster files (ecw)) on the central > file server. > For a shape file with a .shp file (size 3 MB) and a .dbf file (size 155 MB) > it takes 7 minutes and 30 seconds to get the shape displayed on screen. > Between the two locations there is a WAN of 10 Mbps. > > Other applications (MapWindow, ArcGIS, DIVA-GIS) only take 40 seconds to do > the same. > My presumption is that Quantum GIS first downloads the entire shape file onto > the client before rendering. The other applications seem only to download the > .shp file and to approach the .dbf file on the file server. > > I have observed that it is the .dbf file that is taking the time because when > I deleted a number of fields in the specific .dbf file time dropped to about > 3 minutes (and the size of the .dbf file dropped to 85 MB). > The other applications still gave the same result of 40 seconds. > > Can someone of you please tell me how Quantum GIS handles shape files on a > remote file server and if / when Quantum GIS will be able to get the same > results in performance as the other applications mentioned above? > > I'm looking forward to receiving your answer. > >
Since we are using gdal/ogr for reading shapefiles, this is probably a question better asked on the gdal mailing list. Let us know if you get some interesting response from them! By the way for such a client / server environment, it is *much* better performance wise and logistically to put your data into PostGIS. Regards Tim > Kind regards > Met vriendelijke groet, > > Hans Windmüller > medewerker GIS > Rijksweg 501 > 1991 AS VELSERBROEK > 0251-661035 > 06-53792012 > [email protected] > www.pwn.nl > -- Tim Sutton - QGIS Project Steering Committee Member (Release Manager) ============================================== Please do not email me off-list with technical support questions. Using the lists will gain more exposure for your issues and the knowledge surrounding your issue will be shared with all. Visit http://linfiniti.com to find out about: * QGIS programming and support services * Mapserver and PostGIS based hosting plans * FOSS Consulting Services Skype: timlinux Irc: timlinux on #qgis at freenode.net ============================================== _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
