Database Applications Database applications are usually partitioned into two or three parts Two-tier architecture--the application resides at the client machine, where it invokes database system functionality at the server machine Three-tier architecture--the client machine acts as a front end and does not contain any direct database calls. The client end communicates with an application server,usually through a forms interface. The application server in turn communicates with a database system to access data. Database System Concepts-7th Edition 1.30 @Silberschatz,Korth and SudarshanDatabase System Concepts - 7 1.30 ©Silberschatz, Korth and Sudarshan th Edition Database Applications ▪ Two-tier architecture -- the application resides at the client machine, where it invokes database system functionality at the server machine ▪ Three-tier architecture -- the client machine acts as a front end and does not contain any direct database calls. • The client end communicates with an application server, usually through a forms interface. • The application server in turn communicates with a database system to access data. Database applications are usually partitioned into two or three parts