[mapguide-users] Does anyone use Feature Joins?

[Andy Morsell]

I have encountered very similar problems with almost every join I have
attempted in MGOS or MGE.  My most recent experience was for a class that I
taught at AU where a polygon SDF file is joined to a small Access database.
Both MGE 2009 and MGOS 2.0.2 just spin on this join with the a CPU maxed
anytime the layer is accessed.  I will let it spin for a couple of minutes
and then end the process.  The crazy thing is that I know for a fact that
this exact join worked just fine in MGE 2008 / MGOS 1.2 because I used the
same dataset for the same class last year!

Andy Morsell, P.E.
Spatial Integrators, Inc.
www.SpatialGIS.com


-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Jackie Ng
Sent: Thursday, December 11, 2008 8:39 PM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Does anyone use Feature Joins?


Hi All,

I was wondering if anyone uses this feature (pardon the pun).

When I first started with MapGuide, this was the feature that was of most
interest to me as it seemed like an easy way to link spatial data with
whatever non-spatial databases we have around.

But after many bad experiences with performance, and some really nasty join
bugs (mainly http://trac.osgeo.org/mapguide/ticket/502), I've have totally
shunned using feature joins, and either resorting to either pre-joining,
baking the data and refreshing the dataset at regular intervals, or using a
spatially enabled rdbms that does the joins at the dbms level.

I've have followed the best practices guide, but is seems every database I
have encountered has its own set of quirks that don't play nice with
MapGuide.

Most of our clients were sold on the feature joins capability (well by my
sales colleagues anyway), and it pains me (as an implementer, one to has to
deliver) to have to workaround this feature because it fails to perform at a
satisfactory level.

I'd like to hear other people's experiences with feature joins. Is your
experience better/worse?

- Jackie
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