What are the main distinguishing features of DSA?

A DSA is a "tierless" architecture. That is, it abandons the traditional layers within a N-tier model of client-web-application server. • A DSA is flat, not stacked.

DSA recognizes that tools may be useful in many places throughout a truly robust application: a rules engine is useful for routing, and for offloading handlers in event processing, and a business rules management system is useful for business users within traditional application logic. Data is not merely something that users type into a form for application code to store in an RDBMS. It is produced outside the application, emitted from within the application and its heterogeneous components, and can be correlated and processed to business advantage.

• No central controller. This is typically some code in the "application" locked into a deployable artifact running in a container (eg, an EAR in an application server) that acts as a front end to a relational database. • No traditional single relational data store with a ... more.

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