<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
Hi,<br>
<br>
i'm trying to get Qgis WMS-Server running on my system. Everything
is fine except the performance which is extremly poor. <br>
<br>
QGIS-Server is doing <br>
<br>
<i>SELECT st_extent("way") FROM "public"."planet_osm_point"</i><i> </i><i>WHERE
(tags->'emergency'='fire_hydrant')</i><br>
<br>
<b>for every tile</b>. <br>
<br>
see <a class="moz-txt-link-freetext"
href="https://osm.wno-edv-service.de/images/osm/snapshots/qgis_extent.png">https://osm.wno-edv-service.de/images/osm/snapshots/qgis_extent.png</a><br>
<br>
The OpenStreetMap database is very! big and each of those - i think
needless - queries runs for some minutes.<br>
<br>
A specific index for that query does exist und is beeing used,
estimatedmetadata is true and autovacuum is running too but may be
the index is getting old during the day.<br>
<br>
Question: <b>Is there a way to force Qgis not to compute the
extent for every tile again and again?</b><br>
<br>
I'm having the same problem (searching the extent) in Qgis Gui only
once at the first attempt to display a PostGis-layer. May be that's
the same.<br>
<br>
I'm running Qgis 10, but the older versions are doing the same.<br>
<br>
May be i'll switch back to MapServer, which does not have those
problems, but i would like to do the job with Qgis because of
WYSIWYG. Or i'll use GeoServer. :(<br>
<br>
Regards<br>
walter
</body>
</html>