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RTR Terminology
Figure 1–6 Two-Tier Client/Server Environment
LKG-11204-98WI
Database Server
DM
Application Presentation
and Business Logic
(ODBC Model)
Figure 1–7 Three-Tier Client/Server Environment
LKG-11205-98WI
Presentation/
User Interface
Application Server/
Business Logic
Database Server
DB
Server
Database
Application
RTR provides a multicomponent software model where clients
running on frontends, routers, and servers running on backends
cooperate to provide reliable service and transactional integrity.
Application users interact with the client (presentation layer)
on the frontend node that forwards messages to the current
router. The router in turn routes the messages to the current,
appropriate backend, where server applications reside, for
processing. The connection to the current router is maintained
until the current router fails or connections to it are lost.
Introduction 1–9