[mapguide-users] Base Layers that are based on Oracle Spatial data

[Jason Birch]

I don't have much experience with tile caching and the new MapGuide, but if the data is only being updated once per day or once every few days, and you have high levels of usage on your web app, I'd have to believe that you would get some kind of performance return from only having to render those layers when they are actually modified...  Hmm.  I think that was a run-on-sentence.
 
Jason

________________________________

From: Traian Stanev [mailto:traian.stanev at autodesk.com]
Sent: Wed 2006-08-02 8:10 PM
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] Base Layers that are based on Oracle Spatial data


If the layer will be changing a lot, is there any point for it to be a base layer at all? Just make it a regular dynamic layer... 

	-----Original Message----- 
	From: Jason Birch [mailto:Jason.Birch at nanaimo.ca] 
	Sent: Wed 8/2/2006 10:12 PM 
	To: users at mapguide.osgeo.org 
	Cc: 
	Subject: RE: [mapguide-users] Base Layers that are based on Oracle Spatial data
	
	
	 
	It would be useful to set a property on the layer like InvalidateDate that would force tile-replacement for tiles that are older than that date.  If this feature was available, it would be possible to set up a trigger in Oracle to invalidate the tile cache for affected layers.  I'd prefer this method to just deleting the cache, because of the huge file IO caused by the delete, and because it would reduce fragmentation of the volume.  This would be usable by other external processes, such as daily SDF updates via FME, etc...
	 
	Jason

________________________________

	From: Traian Stanev [mailto:traian.stanev at autodesk.com]
	Sent: Wed 2006-08-02 4:42 PM
	To: users at mapguide.osgeo.org; users at mapguide.osgeo.org
	Subject: RE: [mapguide-users] Base Layers that are based on Oracle Spatial data
	
	
	 
	As far as I understand it, only changes to the layer or map definitions will be detected. For example change in the styling for the layer. Changes to the actual data in Oracle will not be detected. 
	 
	Traian
	 

		-----Original Message----- 
		From: Butler, Juan P [mailto:jpbutler at co.pinellas.fl.us] 
		Sent: Wed 8/2/2006 5:36 PM 
		To: users at mapguide.osgeo.org 
		Cc: 
		Subject: RE: [mapguide-users] Base Layers that are based on Oracle Spatial data
		
		

		Well, I've been told that Enterprise handles the changes to data that is stored in the repositories.  From my understanding, data that is changed in the repositories will be marked in someway so that the tiles can be rebuilt as needed.    Can someone from Autodesk please clarify this? 

		 

		Juan Butler - Senior Programmer/Analyst
		GIS Applications
		Pinellas County Information Systems
		jpbutler at pinellascounty.org

		 

		Please note: All mail sent to and from Pinellas County Government is subject to the Public Records Law of Florida.

		 

		 

		
________________________________


		From: Andy Morsell [mailto:amorsell at spatialgis.com] 
		Sent: Wednesday, August 02, 2006 5:30 PM
		To: users at mapguide.osgeo.org
		Subject: RE: [mapguide-users] Base Layers that are based on Oracle Spatial data

		 

		My understanding of the current functionality of base layers is that they don't update themselves based on an underlying data change regardless of the source data type.  This would be up to you to delete the images from your TileCache directory to force them to rebuild the next time somebody viewed that map area.

		 

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

		
________________________________


		From: Butler, Juan P [mailto:jpbutler at co.pinellas.fl.us] 
		Sent: Wednesday, August 02, 2006 2:02 PM
		To: users at mapguide.osgeo.org
		Subject: [mapguide-users] Base Layers that are based on Oracle Spatial data

		Does anyone at Autodesk (or anyone that has tested it already) know if I use Oracle Spatial data for my base layers, will Mapguide Enterprise know about the changes and update the tiles accordingly?   I'm in the process of testing this and just wanted to know if anyone has had any experience with it.

		 

		Thanks.

		 

		Juan Butler - Senior Programmer/Analyst
		GIS Applications
		Pinellas County Information Systems
		jpbutler at pinellascounty.org

		 

		Please note: All mail sent to and from Pinellas County Government is subject to the Public Records Law of Florida.

		 

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