ABC

1. Marathwada Mitramandal’s
COLLEGE OF ENGINEERING
Karvenagar, Pune
Accredited with ‘A++’ Grade by NAAC
Presentation
On
Subject: Database Managemnet System
by
Prof. Shinde S.A.
Department of Artificial Intelligence & Data Science

2. Unit-5:NoSQL Databases
Session-27/40
Introduction to Distributed Database System
Session Plan

3. Outline:
A. Attendance
B. Review of the previous session
C. Learning Outcomes of the session
D. Content
E. Student’s evaluation
F. Preparation for next session
G. Wrap up

4. B. Review of previous session:
●Overall discussion of concept of distributed databases.

5. C. Learning Outcomes of the session:
• To know the basics of Distributed databases
● Advantages n disadvantages of distributed databases
● Different examples in day-to-day life.

6. D. Content:
Contents Learning /
Methodology
Faculty
Approach
Typical Student
Activity
Skill/
Competency
Developed
Basics of Distributed
Database System
PPT
Explain Understand
Critical Thinking
- Observation

7. Slide 25- 7
Distributed Database Concepts
• A transaction can be executed by multiple networked computers in
a unified manner.
• A distributed database (DDB) processes Unit of execution (a
transaction) in a distributed manner. A distributed database (DDB)
can be defined as
• A distributed database (DDB) is a collection of multiple logically related
database distributed over a computer network, and a distributed database
management system as a software system that manages a distributed
database while making the distribution transparent to the user.

8. Slide 25- 8
Types of Distributed Database Systems
• Homogeneous
• All sites of the database
system have identical
setup, i.e., same database
system software.
• The underlying operating
system may be different.
• For example, all sites run
Oracle or DB2, or Sybase
or some other database
system.
• The underlying operating
systems can be a mixture
of Linux, Window, Unix,
etc.
Site 5
Site 1
Site 2
Site 3
Oracle Oracle
Oracle
Oracle
Site 4
Oracle
Linux
Linux
Window
Window
Unix
Communications
network

9. Slide 25- 9
Types of Distributed Database Systems
• Heterogeneous
• Federated: Each site may run different database system but the data
access is managed through a single conceptual schema.
• This implies that the degree of local autonomy is minimum. Each site
must adhere to a centralized access policy. There may be a global
schema.
• Multidatabase: There is no one conceptual global schema. For data
access a schema is constructed dynamically as needed by the
application software.
Communications
network
Site 5
Site 1
Site 2
Site 3
Network
DBMS
Relational
Site 4
Object
Oriented
Linux
Linux
Unix
Hierarchical
Object
Oriented
Relational
Unix
Window

10. Slide 25- 10
Types of Distributed Database Systems
• Federated Database Management Systems Issues
• Differences in data models:
• Relational, Objected oriented, hierarchical, network, etc.
• Differences in constraints:
• Each site may have their own data accessing and processing constraints.
• Differences in query language:
• Some site may use SQL, some may use SQL-89, some may use SQL-92, and so on.

11. E. Student’s evaluation
Discussion , Question answer during the session.

12. ● Advantages, Disadvantages, CAP Theorem.
F. Preparation for Next Session:-

13. G. Wrap Up
In this lecture we have learned
∙ ● Basics of Distributed databases.
∙ ● Advantages & disadvantages of DD.