Database Management System can be classified on several DBMS criteria.
A) On the Basis of Data Models.
Data model is a collection of high level data description that hides
many low level storage details. A data Model has following three
Components:
1) A Structural Part that consist of a set of rules according to which database is constructed.
2) A Manipulating Part That defines type of operations that are allowed on data.
3) A set of integrity rules that ensures that data is correct.
The Data Models are further divided into Three Categories:
1) A Structural Part that consist of a set of rules according to which database is constructed.
2) A Manipulating Part That defines type of operations that are allowed on data.
3) A set of integrity rules that ensures that data is correct.
The Data Models are further divided into Three Categories:
I) Object Base Data Models:
Object based data models defines a database in terms of objects, their
properties, and their operations .Objects of same behavior and structure
belongs to a class and classes are organized into hierarchies. The
operations of each class are specified in terms of predefined procedures
called methods. Commonly used object based data models are:
