Database Management System
DBMS (Database Management System) is a software package designed for defining,
manipulating, retrieving and managing data in a database. Generally, data, the data format,
record structure, filed names and file structure are manipulated itself by a DBMS. The rules are
defined to validate and manipulate the data by database management system.
Database Model
Database model can be defined as a representation or logical structure of a database and the data
within it will be stored, managed and processed. A database can be designed with its help which
while creating a database serves as blueprint for application developers and data administrators.
There are various database models and some of the most popular database models include:
Hierarchal Model
Network Model
Relational Model
Object Oriented Model
Entity Relationship Model
[ CITATION tecnd4 \
l 1033 ]
1. Hierarchal Model: This model is the first model of DBMS where the data are organized
in the hierarchal tree structure. In 1968, IBM developed this model and was introduced in
Information Management System (IMS0. The hierarchy begins from the root having root
data which later develops as tree where child node is added to the parent node. Some of
the real-world relationships can be represented by this model such as recipes of food, site
map of websites and many more. For instance: The relationship between the shoes that is
present in the shopping website can be represented as:
