The Logical Design for a Database System

The information level at the highest level of a hierarchy is called the root demonstrate, and this root record is the point of entry into the hierarchy. Data elements ar stored and located by moving progressively downward from the root to the subordinate data elements until the desired data element is located.

2. Network mental synthesis. In this mental synthesis, the synthetic relationships between data elements may be more Gordian than is possible in the hierarchical structure, because this structure permits relationships to be many-to-many, as opposed to the one-to-many restriction in the hierarchical structure. With the many-to-many relationships characteristic, the network structure permits entry into a data arse at multiple points.

3. Relational structure. This structure was developed in an effort to simplify the representation of building complex relationships between data elements in very large databases. In the relational structure, all data elements within a database are viewed as being stored in the form of simple tables. This same tabular form may also be utilize to represent relationships between projects, divisions, product lines, and so forth. Data base management system programs link the data elements from the various tables include in the databases.

In a database with a relational structure, the tables containing the data elements are known as relation

Dennis, A., & Wixom B. (2003). Systems analysis and design. (2nd ed.). New York: John Wiley and Sons.

Third, control of databases is removed from programmers and check users and placed in the hands of a database administrator

Object-oriented technology has the efficiency to integrate data and make its use transparent to users. The Object-Oriented Systems epitome Model (Embley, Jackson, & Woodfield, 1995) provides such transparency and improves the effectiveness of database systems.

Embley, D. W., Jackson, R. B., & Woodfield, S. N. (1995 July). OO systems analysis: Is it or isn't it? IEEE Software, 12(4), 19-33.

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