Wendell Rios

When I started using distributed DataWindows, the slow performance frightened me, usually when the middle server and the client were in separate computers. At that time I was using a PIII 500 desktop computer, and a PIII 800 database server over a 10MB network. Although it's not the top-of-the-line hardware environment, it's still the best some customers can get. Back then I had resolved to make a few sets of tests, trying to discover the reasons for performance differences between traditional client/server and the n-tier application, and possible workarounds. Despite different headers, control flags, and calling syntaxes between n-tier and pure client/server models, obviously the main difference is the amount of data that's carried from one point to another. In a typical client/server environment, the Retrieve DataWindow function gets only the data. In an n-tier env... (more)

Rapid n-Tier Windows and Web Application Development

In recent years the two-tier client/server model was reevaluated and a new concept built on scalability and maintainability was born: the n-tier application development paradigm. Leveraged by Internet popularization and the consequent growth of Web data-driven applications, the multitier model uses thin, pure, interface clients, middle-tier business objects installed on application/transaction servers, and database objects on RDBMS. The multitier model is definitely more effective: more distributed, encapsulated, and generic. However, client/server development is very mature, o... (more)

Rapid n-Tier Windows and Web Application Development

In recent years the two-tier client/server model was reevaluated and a new concept built on scalability and maintainability was born: the n-tier application development paradigm. Leveraged by Internet popularization and the consequent growth of Web data-driven applications, the multitier model uses thin, pure, interface clients, middle-tier business objects installed on application/transaction servers, and database objects on RDBMS. The multitier model is definitely more effective: more distributed, encapsulated, and generic. However, client/server development is very mature, o... (more)

Boosting Performance on DataWindow Retrieval in n-Tier Environments

When I started using distributed DataWindows, the slow performance frightened me, usually when the middle server and the client were in separate computers. At that time I was using a PIII 500 desktop computer, and a PIII 800 database server over a 10MB network. Although it's not the top-of-the-line hardware environment, it's still the best some customers can get. Back then I had resolved to make a few sets of tests, trying to discover the reasons for performance differences between traditional client/server and the n-tier application, and possible workarounds. Despite different hea... (more)