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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>By default there are a series of timeouts that are set that
could be affecting what you are seeing. Adjusting the timeouts completely
depends on the behavior of the users.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>For example as a developer working on a map you may want to
significantly increase the timeout settings to allow connections to last for 20
min or more whereas a user on the production server may spend no more than 5 or
10 min querying a map so holding connections for too long is a waste or can
potentially not free up resources for other users.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Most of the default settings hold a session for about 20 min. So
after you let your map sit for 20 min you will have to refresh it. However
below the main timeout settings there is Connection Pooling taking place within
FDO. These connections are held for 10 min (600 seconds) and then released. You
may want to try and up this to 20 min to match the other timeouts. However in
testing we have never seen the link failure error that I am aware of.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>A communication link failure seems more like something external
to FDO has dropped the connection rather than FDO dropping the connection. FDO
is trying to use a connection that is no longer valid for some reason. Is there
a proxy server or firewall or router in between your MapGuide server and your
database server that could be dropping the connection? I’ve done some Google
searches and one possibility is that your DSN has connection pooling enabled
and it may be that the connection is dropped by SQLServer by the time you try
to reuse it. It’s not clear yet if it’s actually a MapGuide bug.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The Google searches weren’t very informative. You might try to
search msdn instead.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dave<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>IElsinga@fac.bm<br>
<b>Sent:</b> Thursday, July 05, 2007 11:05 AM<br>
<b>To:</b> MapGuide Users Mail List<br>
<b>Subject:</b> RE: [mapguide-users] ODBC Point features failure<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi Dave, thanks
for the responses... </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I didn't know
about the error log - there are indeed error messages like the following: </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><2007-07-05T13:54:45>
fac</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Error:
Failed to stylize layer: Points</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
An exception occurred in FDO component.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
RDBMS: [Microsoft][ODBC SQL Server Driver]Communication link
failure </span><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> StackTrace:</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> -
MgStylizationUtil.StylizeLayers line 923 file
c:\build_bond_area\mapguide_open_source_v1.2\build_18.1\mgdev\server\src\services\mapping\StylizationUtil.cpp
Failed to stylize layer: Points</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>An exception
occurred in FDO component.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>RDBMS:
[Microsoft][ODBC SQL Server Driver]Communication link failure </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Why would there
be a Communications link failure? We have lots of processes which communicate
to that particular database continually. It seems that something inside
the FDO provider times out and it thinks it can no longer access SQL Server.
</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If I restart
the mapguide service and re-open the site, it initially works. If I let
it just sit there for a few minutes, without doing any zooming or panning or
clicking, then when I try to zoom after that, the points disappear - and that
error message above is in the error log. So it seems that something in
the FDO provider is timing out - it is allowing the connection to timeout
perhaps and it doesn't re-establish it? </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks for your
help, </span><br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Ian Elsinga<br>
</span><br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"Dave
Wilson" <dave.wilson@autodesk.com></span></b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'> </span><br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Sent by:
mapguide-users-bounces@lists.osgeo.org</span> <o:p></o:p></p>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>07/05/2007
11:36 AM</span> <o:p></o:p></p>
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<p class=MsoNormal align=center style='text-align:center'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Please respond to<br>
MapGuide Users Mail List <mapguide-users@lists.osgeo.org></span><o:p></o:p></p>
</td>
</tr>
</table>
</td>
<td width="59%" valign=top style='width:59.0%;padding:.75pt .75pt .75pt .75pt'>
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style='font-size:7.5pt;font-family:"Arial","sans-serif"'>To</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"MapGuide
Users Mail List" <mapguide-users@lists.osgeo.org></span> <o:p></o:p></p>
</td>
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<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>cc</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>RE:
[mapguide-users] ODBC Point features failure</span><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Are
there any errors logged in the server error log? It seems to me something is
causing the provider to die? Usually there is at least 1 error logged before
something like this can happen.</span> <br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What
coordinate system is your data in and what coordinate system is your map in?</span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Have
you tried using the DWF Viewer/Autodesk Design Review? I’m curious if it’s the
data or something in the viewer behavior.</span> <br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,</span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dave</span>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span>
<br>
<b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>IElsinga@fac.bm<b><br>
Sent:</b> Thursday, July 05, 2007 6:25 AM<b><br>
To:</b> MapGuide Users Mail List<b><br>
Cc:</b> MapGuide Users Mail List; mapguide-users-bounces@lists.osgeo.org<b><br>
Subject:</b> RE: [mapguide-users] ODBC Point features failure</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
I noticed that when it stops working, there are no more SQL statements being
sent to the database. (Discovered by using SQL Profiler). </span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Ian Elsinga<br>
Senior Client/Server Application Developer<br>
First Atlantic Commerce<br>
Bermuda<br>
<br>
mailto:ielsinga@fac.bm<br>
Phone : (441) 294-4640<br>
Primary Fax : (441) 295-6855 <br>
Secondary Fax : (441) 295-6708<br>
<br>
http://www.firstatlanticcommerce.com<br>
<br>
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br>
The information in this Internet e-mail, including attachments, contains
information that is confidential and may be protected by attorney client
privileges. This email, including attachments, constitutes non-public
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it is addressed and may contain legal or financial information which is
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please delete this Internet e-mail, including attachments, immediately and
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action taken or omitted to be taken in reliance on it is prohibited, and may be
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<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>IElsinga@fac.bm</span></b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'> <br>
Sent by: mapguide-users-bounces@lists.osgeo.org</span> <o:p></o:p></p>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>07/05/2007
09:15 AM</span> <o:p></o:p></p>
<p><o:p> </o:p></p>
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padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal align=center style='text-align:center'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Please respond to<br>
MapGuide Users Mail List <mapguide-users@lists.osgeo.org></span><o:p></o:p></p>
</td>
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<td width="52%" valign=top style='width:52.0%;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><o:p> </o:p></p>
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style='font-size:7.5pt;font-family:"Arial","sans-serif"'>To</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>MapGuide
Users Mail List <mapguide-users@lists.osgeo.org></span> <o:p></o:p></p>
</td>
</tr>
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<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>cc</span><o:p></o:p></p>
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style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Subject</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>RE:
[mapguide-users] ODBC Point features failure</span><o:p></o:p></p>
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<p class=MsoNormal><br>
<o:p></o:p></p>
<p><o:p> </o:p></p>
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<p><br>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
Thanks for the response - there is 4GB of RAM on the mapguide server which is
running Windows Server 2003. There are no properties selected and there
are only two layers. It is pulling data via ODBC from SQL Server on
another server which is configured similarly. </span> <span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
I can use the map for a few minutes, zooming, panning, clicking on points,
etc., but then the points disappear for no reason and the only way I can get
them back is to restart the mapguide service. </span> <span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
Is this a bug I should report somewhere? <br>
<br>
Thanks, <br>
<br>
Ian Elsinga<br>
Senior Client/Server Application Developer<br>
First Atlantic Commerce<br>
Bermuda<br>
<br>
mailto:ielsinga@fac.bm<br>
Phone : (441) 294-4640<br>
Primary Fax : (441) 295-6855 <br>
Secondary Fax : (441) 295-6708<br>
<br>
http://www.firstatlanticcommerce.com<br>
<br>
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br>
The information in this Internet e-mail, including attachments, contains
information that is confidential and may be protected by attorney client
privileges. This email, including attachments, constitutes non-public
information intended only for the use of the designated recipient(s) to which
it is addressed and may contain legal or financial information which is
privileged, confidential or subject to copyright. Access by any other person to
this Internet e-mail is not authorized. If you are not the intended recipient,
please delete this Internet e-mail, including attachments, immediately and
notify the sender by return email. Any disclosure of this Internet e-mail,
including attachments, or of the parties to it, or copying, distribution or any
action taken or omitted to be taken in reliance on it is prohibited, and may be
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<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"Dave
Wilson" <dave.wilson@autodesk.com></span></b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'> <br>
Sent by: mapguide-users-bounces@lists.osgeo.org</span> <o:p></o:p></p>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>07/04/2007
06:47 PM</span> <o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class=MsoNormal align=center style='text-align:center'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Please respond to<br>
MapGuide Users Mail List <mapguide-users@lists.osgeo.org></span><o:p></o:p></p>
</td>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"MapGuide
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>RE:
[mapguide-users] ODBC Point features failure</span><o:p></o:p></p>
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<br>
<br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>
<br>
In house testing with a feature source containing almost 10,000 features
appears to work fine.</span> <br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>
How much memory on your system? What is the OS? Do you have properties selected
on your layer? How many other layers are in your map?</span> <br>
<span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>
Regards,</span> <span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><br>
Dave</span> <br>
<b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br>
From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>IElsinga@fac.bm<b><br>
Sent:</b> Wednesday, July 04, 2007 10:33 AM<b><br>
To:</b> mapguide-users@lists.osgeo.org<b><br>
Subject:</b> [mapguide-users] ODBC Point features failure</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
I am using MGOS 1.2 RC2 and am experiencing a problem with an ODBC connected to
SQL Server point source. Points are displayed initially, but then
eventually they are not displayed any longer. Opening a new web browser
does not help. The only way I can get them to come back is to restart the
MapGuide windows service - then the points will come back - for a few minutes
of interaction. </span> <span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
I am bringing back 1000 points from a SQL Server database. This
behaviour was the same in 1.2 RC1. <br>
<br>
This will obviously make mapguide unusable for our purposes - is there a
problem with the ODBC FDO? </span> <span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><br>
<br>
I will be grateful for any assistance! </span> <span style='font-size:
10.0pt;font-family:"Arial","sans-serif"'><br>
<br>
<br>
Ian Elsinga</span><span style='font-size:10.0pt;font-family:"Courier New"'>_______________________________________________<br>
mapguide-users mailing list<br>
mapguide-users@lists.osgeo.org<br>
http://lists.osgeo.org/mailman/listinfo/mapguide-users<br>
_______________________________________________<br>
mapguide-users mailing list<br>
mapguide-users@lists.osgeo.org<br>
http://lists.osgeo.org/mailman/listinfo/mapguide-users<tt>_______________________________________________</tt><br>
<tt>mapguide-users mailing list</tt><br>
<tt>mapguide-users@lists.osgeo.org</tt><br>
<tt>http://lists.osgeo.org/mailman/listinfo/mapguide-users</tt></span><o:p></o:p></p>
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