[Qgis-developer] Geospackage Slow in QGIS

[Jeremy Palmer]

HI Stefan,

Call from QGIS is here: https://github.com/qgis/QGIS/blob/master/src/providers/ogr/qgsogrfeatureiterator.cpp#L45

GDAL code is here:

http://trac.osgeo.org/gdal/browser/trunk/gdal/ogr/ogrsf_frmts/gpkg/ogrgeopackagedatasource.cpp#L421

My profiler says all the time is in OGRGeoPackageDataSource::Open.

Also a simple check via the command line for the given database:

qlite3 test_parcels.gpkg
sqlite> .timer ON
sqlite> PRAGMA integrity_check;
ok
CPU Time: user 3.384211 sys 0.756047

Cheers,
Jeremy
________________________________________
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

Hi Jeremy

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?

Yours, Stefan



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?

Cheers,
Jeremy

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