Database Systems From The Point Of View Of The Architecture

2.9 CLIENT/SERVER ARCHITECTURE So far in this chapter we have been discussing database systems from the point of view of the architecture in Fig. 2.3. In this section we offer a slightly different perspective on the subject. The overall purpose of a database system is to support the development and execution of database application. From a high-level point of view, therefore, such a system can be regarded as having a very simple two-part structure, consisting of a server, also called the back end, and a set of clients, also called the front end (refer to Fig. 2.5). Explanation: 1. The server is just the DBMS itself. It supports all of the basic DBMS functions discussed in Section 2.8-data definition, data manipulation, data security and integrity, and so on. In other words, â€Å"server† in this context is just another name for the DBMS. 2. The clients are the various applications that run on top of the DBMS-both user-written applications and built-in application (i.e., applications provided by the DBMS vendors or some third party). As far as the server is concerned, of course, there is no difference between user-written and built-in applications; they all use the same interface to the server-namely, the external-level interface discussed in Section 2.3. 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