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Figure 9-3. Three-tier architecture
Figure 9-4. An N-tier system
Oracle
Database
Service
Client
-GUI
Application Server
-Services logic
-Funneling
-Load-balancing
-Transaction control
Database
-Data
-SQL
Service Calls
Application
Server
Service
Service
Service
Service
Oracle
Instance
Web Server
Browser
HTTP(s)
Application
Server
Oracle Database
Server
JDBC HTTP(s)
J2EE Application
Server Proxy
J2EE Application
Server
Oracle Features for OLTP | 211
In this way, the grid gives IT departments the ability to achieve the benefits of more
complex architectures while not imposing undue complexity on users, and OLTP
applications are deployed using grid computing resources.
Oracle Features for OLTP
Oracle has many features that contribute to OLTP performance, reliability, scalability,
and availability. This section presents the basic attributes of many of these
features. This section is by no means exhaustive; it??™s only intended to be an introduction.
Please see the relevant Oracle documentation and third-party books for more
information.


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