<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">Hi Michał,<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">Without knowing a lot about the underlying implementation, I would expect those flags to make no difference in performance. They exist for safety reasons (so you don't modify a dataset by mistake), not as an optimization.<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">As for the docs, that seems expected. The documentation can't list all the things that a flag does not do.<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">Laurentiu<br></div><div style="font-family:Arial;"><br></div><div>On Thu, Jan 16, 2025, at 09:16, Michał Kowalczuk via gdal-dev wrote:<br></div><blockquote type="cite" id="qt" style=""><div dir="ltr"><div>Any thoughts? :-)<br></div><div><br></div><div class="qt-gmail_quote qt-gmail_quote_container"><div dir="ltr" class="qt-gmail_attr"><div>---------- Forwarded message ---------<br></div><div>Od: <b class="qt-gmail_sendername" dir="auto">Michał Kowalczuk</b> <span dir="auto"><<a href="mailto:michkowalczuk@gmail.com">michkowalczuk@gmail.com</a>></span><br></div><div>Date: wt., 14 sty 2025 o 12:41<br></div><div>Subject: GDAL open flags<br></div><div>To: <<a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a>><br></div></div><div><br></div><div><br></div><div dir="ltr"><div>Hi gdal-group!<br></div><div><br></div><div>Does GDAL_OF_READONLY / GDAL_OF_UPDATE have any impact on performance, especially when reading common vector files (shp, gpkg, gml)? There is no recommendation on this in docs.<br></div><div><br></div><div>Best regards,<br></div><div>Michał Kowalczuk<br></div></div></div></div><div>_______________________________________________<br></div><div>gdal-dev mailing list<br></div><div><a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br></div><div><a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br></div><div><br></div></blockquote><div style="font-family:Arial;"><br></div></body></html>