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<p>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. <br>
</p>
<p>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.<br>
</p>
<div class="moz-cite-prefix">On 17/03/23 01:04, Árni Geirsson via
QGIS-User wrote:<br>
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cite="mid:CALtMHXiTNp-Xsa8DGg8mwXoXiDG9mYgjPD05rE41kH+jYB-W3w@mail.gmail.com">
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<div dir="ltr">Hi Jorge
<div>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.<br clear="all">
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<div dir="ltr" class="gmail_attr">On Thu, 16 Mar 2023 at 11:47,
Jorge Gustavo Rocha via QGIS-User <<a
href="mailto:qgis-user@lists.osgeo.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">qgis-user@lists.osgeo.org</a>>
wrote:<br>
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<div>
<p>Hi,</p>
<p>For data storage and manipulation databases are suitable.
Files are not. <br>
</p>
<p>Geopackages are wonderful to transfer data between
systems or to archive an entire project (snapshot of data,
styles and the project itself).</p>
<p>Regards,</p>
<p>Jorge<br>
</p>
<div>On 16/03/23 11:30, Árni Geirsson via QGIS-User wrote:<br>
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<blockquote type="cite">
<div dir="ltr">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.
<div>Should this perhaps be discussed in another forum,
closer to the development of geopackage/sqlite?<br
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, 16 Mar 2023 at
09:52, Sadowski Jarosław <<a
href="mailto:jaroslaw.sadowski@cpk.pl"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">jaroslaw.sadowski@cpk.pl</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
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<div>
<div lang="PL">
<div>
<p class="MsoNormal"><span lang="EN-US">Long
story short: gpkg is bad idea for network
drives as SMB/NAS etc</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Sources:<br>
</span><a
href="https://www.sqlite.org/wal.html#advantages"
target="_blank" moz-do-not-send="true"><span
lang="EN-US">Write-Ahead Logging
(sqlite.org)</span></a></p>
<p class="MsoNormal"><a
href="https://github.com/r-spatial/sf/issues/628"
target="_blank" moz-do-not-send="true"><span
lang="EN-US">writing gpkg and sqlite on
samba shares fails · Issue #628 ·
r-spatial/sf · GitHub</span></a></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> QGIS-User <<a
href="mailto:qgis-user-bounces@lists.osgeo.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">qgis-user-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Árni Geirsson via
QGIS-User<br>
<b>Sent:</b> Thursday, March 16, 2023
10:18 AM<br>
<b>To:</b> <a
href="mailto:jhubbslist@att.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">jhubbslist@att.net</a><br>
<b>Cc:</b> <a
href="mailto:qgis-user@lists.osgeo.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> [EXTERNAL] Re:
[Qgis-user] Geopackage slow on NAS if
not read-only</span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div style="border:1pt solid
rgb(156,101,0);padding:2pt"
id="m_5292080438416008098m_-2869550827560755875m_448025373283784848m_-6768445286251198089footer">
<p class="MsoNormal"
style="background:rgb(255,235,156)"><span
style="color:black">UWAGA: Ta wiadomość
pochodzi spoza CPK Sp. z o.o. Proszę pomóż
zadbać o bezpieczeństwo naszej
organizacji. </span><span
style="color:black" lang="EN-US">Zastanów
się, zanim otworzysz link lub załącznik.</span><span
lang="EN-US"></span></p>
</div>
<p class="MsoNormal" style="margin-bottom:12pt"><span
lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US">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? </span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">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.</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">If
I store the geopackage on the local
hard drive, the problem disappears,
read-write or read-only does not
matter.</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">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.<br
clear="all">
</span></p>
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<p
class="MsoNormal"><span
style="color:black" lang="EN-US">Árni Geirsson</span><span lang="EN-US"></span></p>
</div>
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<p
class="MsoNormal"><span
lang="EN-US"> </span></p>
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<div>
<p class="MsoNormal"><span lang="EN-US">On
Thu, 16 Mar 2023 at 01:45,
jhubbslist--- via QGIS-User <</span><a
href="mailto:qgis-user@lists.osgeo.org" target="_blank"
moz-do-not-send="true"><span
lang="EN-US">qgis-user@lists.osgeo.org</span></a><span
lang="EN-US">> wrote:</span></p>
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<p class="MsoNormal"><span
lang="EN-US">Árni -</span></p>
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<p class="MsoNormal"><span
lang="EN-US"> </span></p>
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<div>
<p class="MsoNormal"><span
lang="EN-US">Are you using
SMB/CIFS to access this NAS, and
are you using wifi or Ethernet to
connect to it?</span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US">- Jeff </span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US">On 3/15/23 3:30 PM,
Árni Geirsson via QGIS-User wrote:</span></p>
</div>
<blockquote
style="margin-top:5pt;margin-bottom:5pt">
<div>
<p class="MsoNormal"><span
lang="EN-US">Hello all QGIS and
geopackage users. </span></p>
<div>
<p class="MsoNormal"><span
lang="EN-US">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.</span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US">What explains
this and does anyone know how
to solve the problem? </span></p>
</div>
<div>
<p class="MsoNormal"><span
lang="EN-US">Do other users
experience this?</span></p>
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<p
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lang="EN-US">Árni
Geirsson</span></p>
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lang="EN-US"><br>
<br>
</span></p>
<pre><span lang="EN-US">_______________________________________________</span></pre>
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<pre cols="72">--
Jorge Gustavo Rocha
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"Take the open source journey with us"
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