In addition, for a number of reasons, the concepts regarding DBMS’ s architecture and design are not as commonly recognized as they should be. In this scenario, one reason can be that the functional database systems community is reasonably small. Additionally, marketplace pushes simply support a small number of competitors at the high end of the business, hence only a small number of successful and well-known DBMSs exist. In addition, the community of people that are concerned with planning and implementation of database systems is tense for the reason that the majority of them concentrated in the similar schools worked on the similar powerful research projects, and worked jointly on the similar profitable products.
Therefore, educational treatment and efforts on database systems frequently pay no attention to architectural issues. On the other hand, theories presented in textbooks and on the internet unadventurously focus on algorithmic and theoretical aspects that are easy to educate, learn, and test regardless of a holistic argument of system structure incomplete applications. However, some data are available that guides how to build up database systems, but a small portion of it has been written down or communicated generally (Hellerstein, Stonebraker, and Hamilton; Hoffer, Prescott, and McFadden). According to various researches, the DBMS architecture is normally divided into three views and levels: • The External view • The conceptual view • The internal view, In addition, the basic purpose of a DBMS is to provide its users with the abstract view of the database.
In other words, the system does not offer all features of the data, however, it conceals the facts of how the actual data are maintained and stored in the database (Bhushan; Rokitskii). This section discusses the major objectives of three-level database architecture.
This architecture is believed to be flexible for the reason that it allows database administrators to transform the structure of the database, without transforming or modifying the software program, for example, external schema.
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