[Qgis-developer] save as spatialite very resource consuming

[Andrea Peri]

The bug of initspatialmetada was resolved in dev versione of qgis.
Il 30/gen/2014 17:24 "kimaidou" <kimaidou at gmail.com> ha scritto:

> Hi all
>
> Could you try to use this commands in QGIS python console ? I have seen
> that the parameter 1 in the function initspatialmetadata is very important
> to have a very fast DB creation. If you are on Windows, change the path
> "/tmp/test.db" by a more appropriate one.
>
> from pyspatialite import dbapi2 as db
> conn=db.connect('/tmp/test.db')
> c=conn.cursor()
> sql = "select initspatialmetadata(1)"
> c.execute(sql) ; print [row for row in c]
>
> Michael
>
>
> 2014-01-30 Stefan Keller <sfkeller at gmail.com>
>
>> Hi,
>>
>> I have to confirm that the file size is huge and saving performance is
>> slow.
>> I'd like to emphasize that this is a show stopper for me for/against
>> Spatialite to become "the Shapefile of the future"!
>> I did not yet look into the QGIS driver code, but I assume (and hope)
>> that at least the saving performance can be enhanced.
>>
>> -Stefan
>>
>> 2014/1/24 Rafael Krucker <rkrucker at hsr.ch>:
>> > Hello all
>> >
>> > I've noticed recently (QGIS 2.0.1, Windows 7 64 bit), that, when I'm
>> > processing a shapefile as layer, even very small ones, the operation
>> 'save
>> > as spatialite' takes forever. With a small shapefile (1 KB), the
>> process of
>> > converting takes up to 3 minutes, the generated spatiallite is then
>> always
>> > around 4000 bigger (4.21 MB). These ratios are the same, no matter how
>> big
>> > the file is, the time taken enlarges linearly it seems.
>> > When the export is a shapefile again, the whole thing is a matter of
>> > seconds.
>> > Is this due to some kind of buffering issues or does this conversetion
>> > simply take that many resources?
>> >
>> > Kind regards and thanks in advance for any pointers
>> > Rafael
>> > _______________________________________________
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>
>
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