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