Logical Data Modeling Assignment PDF

Added on - 13 Sep 2021

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Running Head: LOGICAL DATA MODELING0
Logical
Data
Modeling
Individual
assignment
Student Name
Logical Data Modeling1
Table of Contents
Task 1(a):.....................................................................................................................................2
Task 1(b):.....................................................................................................................................3
Task 2...........................................................................................................................................4
Task 3...........................................................................................................................................5
References........................................................................................................................................8
Logical Data Modeling2
Task 1(a):
Database is a collection of data in record format. They are used for managing all the data at a
single place. Database is separated in four parts, which are:
Hierarchical databases.
Network databases.
Relational databases.
Object-oriented databases
Hierarchical database is structure as a tree. It uses parent child-relationship for managing all the
records. It store information as a table format. It follows relational model for arranging the data,
such as levels. RDM mobile and Information Management System of IBM are based on this
approach.
Network database is used for large databases. In this database, different connections can be made
for more efficiency. It is also follow the hierarchical database and maintain a parent-child
relationship in between different records. All the records are interconnected and it is having fast
access of records. It follows network model for managing records and it maintain a many-to-
many relationship in the data. Integrated Data Store (IDS) is an example of Network database.
Relational databases maintain a relational relationship between the data. It uses key fields for
making connection between different tables for accessing the data, such as primary key, foreign
key. It is more reliable than hierarchical and network databases, as it is reduce redundancy
between data. MySQL, PostgreSQL SQL Server, MySQL, Oracle are examples of relational
databases.
Object oriented databases are following object-oriented model for storing data and accessing data
from the databases. It uses object oriented programming language concept for making it more
consistent.
Flat files are also used for data storage, such as text file, binary files in C and C++ programming
languages.
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