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Figure 1–6 Two-Tier Client/Server Environment
Figure 1–7 Three-Tier Client/Server Environment
Presentation/User Interface
RTR extends the three-tier model, which is based on hardware,
to a multilayer, or multicomponent software model.
RTR provides a multicomponent software model where client
RTR Software
applications running on frontends, combined with routers and
Components
server applications running on backends cooperate to provide
reliable service and transactional integrity. Application users
interact with the client (presentation layer) on the node with the
frontend role 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
Application Presentation
and Business Logic
(ODBC Model)
Application Server/
Business Logic
RTR Terminology
Data Manager
software
Database
Server
VM-0824A-AI
Database
Server
Database
Application
Database
Server
VM-0825A-AI
Introduction 1–11
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