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<p>Originally its in MSSQL, we have done a makevalid() on all lines before we use OGR2OGR to export it to a GeoPackage. That file is on the local NVME drive. We did try setting the spatial index to no, this had very little difference in time. </p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; color:#1F497D">Dennis Burgess</span></b><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Frank Broniewski <broniewski@a-a.lu><br>
<b>Sent:</b> Wednesday, February 7, 2024 12:35:52 AM<br>
<b>To:</b> QGIS-User@lists.osgeo.org; Dennis Burgess<br>
<b>Subject:</b> AW: [Qgis-user] Optimize QGIS Command_Line</font>
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<div class="elementToProof" style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">
Hi Dennis,</div>
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<div class="elementToProof" style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">
concerning your first command, is your GeoPackage stored locally or on a network drive? Writing SQLite/GepPackage databases onto a network drive can have a severe performance impact. Another idea, did you try setting -lco SPATIAL_INDEX=no and creating the index
after the import? This might speed up your import as well.</div>
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<div class="elementToProof"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">This page
<a href="https://gdal.org/drivers/vector/sqlite.html">https://gdal.org/drivers/vector/sqlite.html</a> has some more insights on performance, but maybe you know it already ...</span></div>
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<div class="elementToProof"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">Concerning your second command, without knowing how many lines / polygons you want to dissolve here (seems like a lot looking at the file
size) it looks pretty normal to me. Keep in mind that dissolving is a rather cost intensive process, when not dissolving by attribute. As every geometry has to be checked against all the others if they can be dissolved spatially - spatial indexes aside. </span></div>
<div class="elementToProof"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">I do not know the internals of the algorithm itself, but I would guess it is not well suited for a threaded / multi process approach and
it just runs on one core of your CPU doing all the work - like most GIS tools do. </span></div>
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<div class="elementToProof"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt; color: rgb(0, 0, 0);">A speedier approach could be to spatially divide your data into smaller parts, do the dissolve on each part to reduce the number of features,
and then finally dissolve the results into the final one ...</span></div>
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<div dir="ltr" id="divRplyFwdMsg"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Von:</b> QGIS-User <qgis-user-bounces@lists.osgeo.org> im Auftrag von Dennis Burgess via QGIS-User <qgis-user@lists.osgeo.org><br>
<b>Gesendet:</b> Dienstag, 6. Februar 2024 15:23<br>
<b>An:</b> QGIS-User@lists.osgeo.org <QGIS-User@lists.osgeo.org><br>
<b>Betreff:</b> Re: [Qgis-user] Optimize QGIS Command_Line</span>
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ogr2ogr -f gpkg geom_multi_38.gpkg "MSSQL:server=xxxxxx;database=xxxxxxxxx;uid=xxxxxxxxx;pwd=xxxxxxxx;MultipleActiveResultSets=true;" -sql "EXEC xxxxxx 42039, 38" -overwrite -gt 1000000 -lco SPATIAL_INDEX=yes OGR_SQLITE_CACHE=10240MB OGR_SQLITE_SYNCHRONOUS=OFF </p>
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This one takes around 30 min to export to gpkg file, if I run the same exec command on sql it takes less than 40 seconds to pull down .. these are geometry lines. Around 940 lines. </p>
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The second one</p>
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"c:\program files\qgis 3.26.2\apps\qgis\bin\qgis_process" run native:dissolve --INPUT=geom_multi_55096.gpkg --OUTPUT=geom_multi_diss_38.gpkg </p>
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This would e one of them. Last job took 49 minutes, orginal input is around 1.2 gig. </p>
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Dedicated platform for processing: 72 cores, 32 gig of RAM, running on NVME disk.</p>
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SQL 2019 Enterprise: 80 cores, 512gig ram, NVME disks.</p>
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<b>From:</b> Johannes Kröger (WhereGroup) <johannes.kroeger@wheregroup.com><br>
<b>Sent:</b> Tuesday, February 6, 2024 2:01 AM<br>
<b>To:</b> Dennis Burgess <dmburgess@linktechs.net>; QGIS-User@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Optimize QGIS Command_Line</p>
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<p>Hey Dennis,</p>
<p>can you share those command lines (maybe with sensitive information stripped)? Otherwise it is hard to guess what the issue might be.</p>
<p>What does your CPU, RAM and I/O utilisation look like during those long running processes? Same for the MSSQL database server host system.</p>
<p>Cheers, Hannes</p>
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On 05.02.24 14:46, Dennis Burgess via QGIS-User wrote:</p>
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<p style="margin: 0in 0in 0.0001pt; font-family: Calibri, sans-serif; font-size: 11pt;">
I have two command lines, one reads from my MSSQL database and creates a GeoPackage on the local disk. This takes WAY too long, just to create it , it uses 5% or less CPU, and is SUPER slow. Looking for methods to speed this up. The data is around 1.2 to
1.4 gig of pop, but it should not take 50 min to create.</p>
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Also I am doing a dissolve on this data, once its on the disk, this also takes quite a while, even though when I do it from QGIS it takes like 10 min vs an hour or more on the computer with the command line.</p>
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I’m sure I am doing something wrong on both of these. Just trying to understand what it would be. </p>
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Thanks for any assistance !</p>
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Dennis</p>
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