Database Models in DBMS

Data Models

Database is made in 1960, is triggered when the need for a system management information flexible. The data model is a set of terms that are used for the database structure can be described. An image or a data model describes how data should be prepared to serve a particular purpose. The data model represents the data elements required, and the data should look like. However, it is misleading to discuss data models, as if the data type of the model, and equally wrong to speak of him, as if used for a purpose.

There are three different types of models and advanced data generated for the purpose of the database to the information system itself. The data must be identified first as a conceptual data model can be essentially a set of technical specifications and independent data are used to discuss the initial needs of the stakeholders of the company.

Data modeling techniques are used :-

• To control data as a resource ( migrate, merge, data quality).
• For designing computer databases.
• To better cope with modify, by allowing to make changes into the model, that will automatically make changes in the database and programs.

Data models can be broadly illustrious into 3 main categories:-

1) High-level or Conceptual Data Models : It provides idea that are close to the way many users recognize data.

2) Low Level or Physical Data Models:- It provides idea that explain the details of how data is stored in the computer.

3) Representational or Implementation Data Models: It provides idea that can be understand by end users. These hide some facts of data storage but can be implemented on a computer system directly.

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