[Qgis-developer] Re : Performance for selection on attribute table

[denis.rouzaud@gmail.com]

Hi Regis,

I discussed this with Matthias today, and it is apparently more related to refreshing the map canvas.

I also noticed very slow selection of features in attribute table for heavy project (regardless of the size of the layer).  But selecting the same layer, being the single one loaded, is very fast.

Matthias might give further thoughts on spatial indexing.

Denis

Envoyé depuis mon HTC

----- Reply message -----
De : "Régis Haubourg" <regis.haubourg at eau-adour-garonne.fr>
Pour : <qgis-developer at lists.osgeo.org>
Objet : [Qgis-developer] Performance for selection on attribute table
Date : mer., mars 27, 2013 20:57


Hi dev's, I was notified some performance matters when dealing with
selections in attribute tables, by some users swithcing from arcgis to QGIS. 
Indexes of datasource seem to be ignored for SQL selection and search. This
leads to very slow selections when dealing with large datasets. 
Anyone confirms?  Is it really related to indexes or another bottleneck? 
Is there any possible improvement ? Are providers working on selections or
is that all dealing with cache? 

Thanks for your feedback , 
Régis



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