SDE三种连接方式
一、Application server connection[*]Traditional ArcSDE connection method
[*]Server requires ArcSDE service
1、giomgr listens for client connection requests
2、gsrvr is spawned for every connection
[*]Performance considerations
1、Decreases client load
2、Increases server load
[*]Role Of ArcSDE:gsrvr
Application server connection life cycle
1、Client requests connection
giomgr listening on assigned port
2、giomgr spawns dedicated gsrvr
Connects to Oracle with user name/password supplied by client
3、gsrve services all client Read/Write requests
4、Client closes connection
gsrvr process terminates
二、Direct connect
1、Connect directly to database
2、No ArcSDE service required
No giomgr or gsrvr process
Software included with ArcGis client
3、Requires Oracle Net software
Installed and configured on client
Oracle listener brokers connections
4、Performance considerations
Increases client load
Decreases server load
5、Role of ArcSDE:direct connect DLL
三、Create OLE DB connections
1、Industry-standard,COM-based data access interface
Next generation ODBC
2、Two providers for Oracle available with ArcGIS clients
Oracle:Distributed with Oracle client
Microsoft:Distributed with MDAC
3、Typically Read-only,non-spatial
ArcObjects programmers can use Read/Write
ArcGis includes ESRI spatially-enabled provider for programmers
页:
[1]