Relational Database Model

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baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd

3. DBMS
• Database is a collection of related data.
• Database Management System(DBMS) is a
collection of programs that enables users to create
and maintain database.
• It facilitates the process of
• Defining
• Constructing
• Manipulating
• Sharing database

4. RDBMS
• A Relational database management system
(RDBMS) is a database management system (DBMS)
that is based on the relational model.
• Features:
• Provides data to be stored in tables
• Persists data in the form of rows and columns
• Each column is an attribute.
• Provides facility primary key, to uniquely identify
the rows

5. • Relationships are not explicit, but implied by
values in specific fields (e.g., foreign keys).
• Disadvantages
• Do not have enough storage area to handle data
such as images, audio, video.
• Information must be in tables where
relationships between entities are defined by
values.

6. Object Oriented Database - OODBMS
OO principles brought to databases:
-New modeling power
-Extensibility of systems
-Code reuse
-Easy maintenance of programs

7. • Object Identity-In object oriented databases objects
are uniquely identified by OID.
• Objects with the same type are grouped into
classes.
• Classes encompass objects having the same
structure and behaviour, which is expressed by the
set of methods or operations applicable to the
objects they contain.

8. • Inheritance: Inheritance is mechanism allowing
child object to inherit behavior and properties of
parent object.
• Encapsulation-A class corresponds to the
implementation of an abstract data type (ADT).
• Neither the structure of the ADT nor its
implementation is visible from the outside world.

9. ORDBMS
• object relational database management
system simply puts an object oriented front
end on a relational database (RDBMS).
• ORDBMS was created to handle new types of
data such as audio,video, and image files .
• PostgresSQL is the best known OR DBMS
• Supports object-oriented design.

10. Advantages of ORDBMS
• Resolves many of known weaknesses of
RDBMS
• It allows users and programmers to start using
object-oriented systems in parallel.

11. Disadvantages of ORDBMSs
• Complexity.
• Increased costs.
• Supporters of relational approach believe simplicity
and purity of relational model are lost.
• Some believe RDBMS is being extended for what
will be a minority of applications.
• OO purists not attracted by extensions either.

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