Essays on Database Management Systems Assignment

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The paper "Database Management Systems" is a wonderful example of an assignment on business. There are several definitions that have been availed by the scholars and various people who have specialized in this field. However, no definition has clearly and solely described what this concept is all about. It is therefore us to combine the various definition and explanations to come up with a concrete understanding of this concept in the database. The first definition is that a data model can be defined as a combination of concepts to clearly explain the structure of a database, the methods involved in manipulating these structures, and procedures and instructions that must be followed in a database (Watt and Navathe, 2014). Another most common definition is a collection of concepts that describe the structure of a database. it is a good way to express data abstraction as a concept.

It can also be used to make a specification of the storage and making of updates. The Data Model’ s dynamic aspect or behavior of a database application allows the database designer to specify a set of valid operations allowed on database objects (Watt and Navathe, 2014). There are several categories of data models.

The most notable ones include High-level which are close to the way many users perceive data, the second is Low-level data models describe the details of how data is stored on computer storage media. The last notable one is representational data models. These models can easily be understood by end-users (Elmasri and Navathe). A data model has several components. The main component includes Entities which represents real-world object or concepts being modeled, Attributes represents some property of interest in the object.

For example in the objecting employee, the attributes could be employee ID, basic salary, and job group. The third component is the relationship among two or more entities. The relationships represent associations among various entities. The relationship expressed could be in a form of to one, one to many, or many to many (Watt and Navathe, 2014).


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