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Extra resources for Database Management Systems Designing & Building Business Applications
Distributed databases discussed in Chapter 11 are a powerful way to create applications that remove the restrictions of location. The Internet is rapidly becoming a powerful tool for building and implementing database applications that can be used by anyone around the world. The same technologies can be used for applications that are accessed only by inhouse personnel. Systems that use Internet technology but limit access to insiders are called intranets. Chapter 12 introduces the considerations of how the DBMS physically stores data.
National boundary), would be a collection of these location points (GeoLine). By storing the data in tables, the application can search and retrieve information based on user requirements. The database also makes it easier to share and to update the data. In the GIS example, the database handles the selection criteria (Region = Europe). The database can also match and retrieve demographic data stored in other tables. The advantage to this approach is that the DBMS handles the data storage and retrieval, freeing the developer to concentrate on the application details.
Application development tools include a report writer, a forms generator, and an application generator to create features like menus and help files. Advanced database systems provide utilities to control secure access to the data, cooperate with other software packages, and communicate with other database systems. Database systems have evolved through several stages. Early hierarchical databases were fast for specific purposes but provided limited access to the data. Network databases enabled users to build complex queries but only if the links were built with indexes in advance.