[Qgis-developer] Geospackage Slow in QGIS
JPalmer at linz.govt.nz
Sat May 17 01:29:22 PDT 2014
Call from QGIS is here: https://github.com/qgis/QGIS/blob/master/src/providers/ogr/qgsogrfeatureiterator.cpp#L45
GDAL code is here:
My profiler says all the time is in OGRGeoPackageDataSource::Open.
Also a simple check via the command line for the given database:
sqlite> .timer ON
sqlite> PRAGMA integrity_check;
CPU Time: user 3.384211 sys 0.756047
From: Stefan Keller [sfkeller at gmail.com]
Sent: Saturday, 17 May 2014 8:20 p.m.
To: Jeremy Palmer
Cc: qgis-developer at lists.osgeo.org
Subject: Re: [Qgis-developer] Geospackage Slow in QGIS
Is this PRAGMA integrity_check really the bottle neck?
Is it an integrity check on a data type (e.g. integer - its probably actually an integrity check on SRID)?
Can you point to the code?
2014-05-17 9:32 GMT+02:00 Jeremy Palmer <JPalmer at linz.govt.nz<mailto:JPalmer at linz.govt.nz>>:
I've just been using the new implementation of Geopackage in QGIS :) However each map render or feature info is very slow for large database files - even with the new GDAL/OGR Geopackage spatial index support. Each time QGIS renders a new map view or executes a feature info it re-opens the Geopackage file in QgsOgrFeatureIterator via OGROpen, and the Geopackage driver open method runs PRAGMA integrity_check which is very slow (4 secs with my 2GB test file). This integrity check is actually a Geopackage requirement.
How can this be fixed? At the in QGIS or GDAL/OGR level?
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