Hi Klaus,
this is something that others have reported to me as well, it seems
that Fusion does some dumb things on initialization that it doesn't
really need to do, including retrieving the schema of layers in the
MapDefinition. Fixing this will require some rearchitecting of how
Fusion starts up and what info is actually needed to be returned to
the client. There are actually two blocking points, one is getting
too much info from the database (which appears to be very slow) and
the other happens when a MapDefinition contains a lot of layers and/or
thematic layers with lots of classes, Fusion generates a large
response that has to be evaluated in the client and this causes a long
delay too.
Both are probably unnecessary or can be minimized, but it will take
some time. I hope that this will be part of the next Fusion release.
Cheers
Paul
On 17-Jun-08, at 7:15 AM, Klaus Lehtonen wrote:
Hi
The problem is that the Fusion Viewer loads very slowly compared to
AJAX and
DWF viewers when using Oracle database as a feature source. The AJAX
and DWF
viewers load to browser in about two seconds, but the Fusion Viewer
takes
tens of seconds and with some maps times out after a minute. The
load time
seems to be related to the amount of layers that use database as
source. If
we use only sdf data sources the Fusion Viewer loads very quickly.
After the
Fusion viewer has loaded zooming and panning work quickly, so the
problem is
only in the initial loading.
I used Firebug to investigate the issue and it shows the LoadMap.php
takes a
lot of time. Other files load pretty quickly. The MapGuide logs show
ten
second pauses when GetClassDefinition has been called, but this only
happens
with part of the calls. Some of the calls cause no problems. During
loading
mgserver2009.exe is the only application using CPU time and it does
not
seem to matter if we use Oracle tables directly or through views.
I wonder if anyone else has had problems using Oracle and Fusion
viewer?
Klaus Lehtonen
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