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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Even Rouault wrote:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Re: [mapserver-users] Speeding up WFS paging with Spatialite and GeoPackage<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:9.0pt;font-family:"Courier New"">On mardi 20 décembre 2016 13:07:27 CET Rahkonen Jukka (MML) wrote:<o:p></o:p></span></p>
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<a href="https://www.postgresql.org/docs/9.1/static/sql-declare.html">https://www.postgresql.org/docs/9.1/static/sql-declare.html</a><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New""> <o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;-qt-block-indent:0;-qt-user-state:0"><span style="font-size:9.0pt;font-family:"Courier New"">In the PostGIS case (I mean not through OGR PG driver), OFFSET and LIMIT are also used:<o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;-qt-block-indent:0;-qt-user-state:0"><span style="font-size:9.0pt;font-family:"Courier New""><a href="https://github.com/mapserver/mapserver/blob/branch-7-0/mappostgis.c#L1968">https://github.com/mapserver/mapserver/blob/branch-7-0/mappostgis.c#L1968</a><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New""> <o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;-qt-block-indent:0;-qt-user-state:0"><span style="font-size:9.0pt;font-family:"Courier New"">Postgres cursors can be used when you have a persistent connection and iterate through the result set (that's what the OGR
PG driver does in its GetNextFeature() implementation). But WFS is state less, so that couldn't be used. Or that would require special code, that could only work in fastCGI with defered connection closing, and likely some timeout mechanism to be able to ditch
cursors no longer being used, to be able to reuse a Postgres iterator among several identical queries that would differ only by their STARTINDEX.<o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New""> <o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">All right, now I understand much better this GDAL ticket
<a href="https://trac.osgeo.org/gdal/ticket/6713">https://trac.osgeo.org/gdal/ticket/6713</a> and the 2-3 times faster response time with tailor made system that is utilizing “next”.<o:p></o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Jukka-<o:p></o:p></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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