Artikel Ilmu Komputer

At all these architecture of processor done at mainframe. Application code, data and all System Components placed and implemented at host. Although computer client used to access mainframe, there is no processor happened at this machine, and because they “dump-client” or “dump-terminal”. This model type, where all processor happened centrality, known as berbasis-host.

In modeling client/server, processor at an application happened at client and server. Client/server it is typical a the application of two-tier with many client and a server connected through a network. Application placed at computer client and machine database implemented at server distance - far. The application of client releases request to database which sends again data to its(the client. In client/server, client-client which is smart accountable for part of application which interaction with user, including business logic and communications with database server. Duty types happened at client is :

• User interface
• interaction of Database
• Retrieval and modification of data
• A number of business orders
• Mistake handling

3. Three-tier / Multi-tier

Model three-tier or multi-tier developed to answer limitation at architecture client/server.
In modeling this, processor is propagated in three layers (or more if it is applied architecture mortifier).

Third layer in this summing up each architecture is special function of tonality. That is:
Presentation service (level of client)
Business service (middle store)
.Data service (level of data source)

Presentation service or user interface logic placed at machine client. Business logic released from code client and placed in middle store. Data service layer contains server
database. Every level in modeling three-tier to stay at stand alone computer. Model concept three-tier is model is dividing function of tonality into layers, application – application gets scale ability, new, and security and safety.