[Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only
Patrick Dunford
enzedrailmaps at gmail.com
Thu Mar 16 06:45:52 PDT 2023
To share files over a network there has to be specific provision in the
software design. Sqlite is designed for single user situations. It is
not a full DBMS.
It would not be recommended to share shapefiles for multi user since it
is still a file based system. To handle multiple users accessing the
same file or data the software has to be able to break the file into
units that can be managed for multiple users. This is part of the design
of DBMS, but not in the case of most types of files.
On 17/03/23 01:04, Árni Geirsson via QGIS-User wrote:
> Hi Jorge
> I understand what you are pointing at and I use databases such as
> Postgres/PostGIS also with good results. The thing is that working
> with data in files sometimes has advantages and that is certainly how
> shapefiles have been used. The geopackage has been suggested as a
> replacement for the shapefile in the context of regular QGIS
> usage without any caveat saying that geopackages only replace the
> storage and transfer role of shapefiles and that geopackages should
> not be used for editing in a shared environment, as is perfectly
> possible with shapefiles and widely practiced. Not all users have
> access to database systems such as Postgres. I'm just looking for some
> clarity on best practices for the common scenario of working with QGIS
> using file based data in a network environment.
>
> Árni
>
>
> On Thu, 16 Mar 2023 at 11:47, Jorge Gustavo Rocha via QGIS-User
> <qgis-user at lists.osgeo.org> wrote:
>
> Hi,
>
> For data storage and manipulation databases are suitable. Files
> are not.
>
> Geopackages are wonderful to transfer data between systems or to
> archive an entire project (snapshot of data, styles and the
> project itself).
>
> Regards,
>
> Jorge
>
> On 16/03/23 11:30, Árni Geirsson via QGIS-User wrote:
>> Thank you Jarosław. Isn't it strange that this was discussed 5
>> years ago and SMB file sharing is very common? Would a linux
>> based NAS be able to use another protocol? What are my options
>> for file based data sharing in QGIS? Abandoning geopackages is
>> not a realistic option for me, but I could get a different kind
>> of NAS unit, if that helps, what kind then? What amazes me is how
>> little I see this discussed. There was a message in this thread
>> this morning from Thomas Struller, but I am not sure it is about
>> the same root problem, maybe Thomas can elaborate.
>> Should this perhaps be discussed in another forum, closer to the
>> development of geopackage/sqlite?
>>
>> Árni Geirsson
>>
>> On Thu, 16 Mar 2023 at 09:52, Sadowski Jarosław
>> <jaroslaw.sadowski at cpk.pl> wrote:
>>
>> Long story short: gpkg is bad idea for network drives as
>> SMB/NAS etc
>>
>> Sources:
>> Write-Ahead Logging (sqlite.org)
>> <https://www.sqlite.org/wal.html#advantages>
>>
>> writing gpkg and sqlite on samba shares fails · Issue #628 ·
>> r-spatial/sf · GitHub
>> <https://github.com/r-spatial/sf/issues/628>
>>
>>
>> *_________________________________*
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>> *From:*QGIS-User <qgis-user-bounces at lists.osgeo.org> *On
>> Behalf Of *Árni Geirsson via QGIS-User
>> *Sent:* Thursday, March 16, 2023 10:18 AM
>> *To:* jhubbslist at att.net
>> *Cc:* qgis-user at lists.osgeo.org
>> *Subject:* [EXTERNAL] Re: [Qgis-user] Geopackage slow on NAS
>> if not read-only
>>
>> UWAGA: Ta wiadomość pochodzi spoza CPK Sp. z o.o. Proszę
>> pomóż zadbać o bezpieczeństwo naszej organizacji. Zastanów
>> się, zanim otworzysz link lub załącznik.
>>
>> Yes, as far as I know, the NAS unit uses SMB as the file
>> sharing protocol. I used another NAS from QNAP before this
>> one, also using SMB and with the same problem. I thought
>> pretty much all of the Linux based NAS units were using SMB
>> and if that is the problem, it should be widespread, but I
>> don't see any signs of that. Is SMB a problem for geopackage?
>>
>> I did a quick test in QGIS: A dataset of 178.000 line
>> features is rendered in about 1 second from a read only
>> geopackage. When I remove the read only flag, it is rendered
>> in about 5 seconds.
>>
>> If I store the geopackage on the local hard drive, the
>> problem disappears, read-write or read-only does not matter.
>>
>> I have had suspicions about SMB being part of the problem but
>> I don't know enough about file access deep down in the
>> operating system to understand it.
>>
>> Árni Geirsson
>>
>> On Thu, 16 Mar 2023 at 01:45, jhubbslist--- via QGIS-User
>> <qgis-user at lists.osgeo.org
>> <mailto:qgis-user at lists.osgeo.org>> wrote:
>>
>> Árni -
>>
>> Are you using SMB/CIFS to access this NAS, and are you
>> using wifi or Ethernet to connect to it?
>>
>> - Jeff
>>
>> On 3/15/23 3:30 PM, Árni Geirsson via QGIS-User wrote:
>>
>> Hello all QGIS and geopackage users.
>>
>> I store my geopackages on a Synology RackStation NAS
>> unit, like all other documents that are kept on a
>> shared drive in the office. For larger datasets, the
>> rendering is very slow, unless I open the properties
>> dialog for the file in Windows and check the read
>> only box. After that, the features are rendered
>> blazingly fast. Nothing else is changed to see the
>> dramatic difference in the rendering speed. Luckily,
>> I don't need to edit many of the larger datasets,
>> such as road networks and elevation contours and
>> the geopackage can be kept read only. Shapefiles are
>> not affected.
>>
>> What explains this and does anyone know how to solve
>> the problem?
>>
>> Do other users experience this?
>>
>> Árni Geirsson
>>
>>
>>
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>
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