[QGIS-trac] [Quantum GIS] #2904: join attributes very slow when vector layer contains many features

[Quantum GIS]

#2904: join attributes very slow when vector layer contains many features
--------------------------------+-------------------------------------------
   Reporter:  mlennert          |              Owner:  jef          
       Type:  enhancement       |             Status:  new          
   Priority:  minor: annoyance  |          Milestone:  Version 1.6.0
  Component:  Vectors           |            Version:  1.4.0        
   Keywords:  join attributes   |   Platform_version:               
   Platform:  Debian            |           Must_fix:  No           
Status_info:  0                 |  
--------------------------------+-------------------------------------------
 Using a polygon layer with about 20,000 polygons and a dbf containing
 information for a bit over 5000 thousand of these polygons, joining them
 with Vector->Join attributes using a common key of 9 chars (letters,
 numbers and -) takes horrendously long, with a CPU usage close to 100%
 throughout the process.

 Classyfying this as an annoyance and a wish for enhancement for now, but
 at least one colleague stopped using QGIS for this reason, so it could be
 seen as a major bug...

 This is somewhat linked to wish #121, but as long as that is not
 fulfilled, this is the only way to join attributes and thus concerns an
 important feature.

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/2904>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats