this presentation about data base

2. Presented by:
• Maryam Abdul Rehman
• Khadija Anwaar
• Kaynat Shahbaz
• Tooba Tanveer
• Syeda Fatima Abbas

3. Points to be discussed:
• What is database?
• What is DBMS?
• DBMS architecture.
• DBMS models.
• It's applications,advantages and disadvantages.

4. What Is DATABASE?
• Collection of related data (collection of
raw facts and figures related to objects).
• Information is not useful if not organized.
• In database, data are organized in a way
that people find meaningful and useful.
• For instance facebook.

5. DBMS:
• Collection of programs.
• It enables it’s users to access database, manipulate data and help in
representation of data.
• Controls access to database by various users.
• End-Users, Application Programmers, and Database Administrators
are they type of users who access a DBMS.
• For example: MYSQL is DBMS used by facebook.

6. • First implemented in 1960's.
• Charles Bachman's integrated data store(IDS) is said to be the first
DBMS in history.
• In 2014 Bachman was awarded the National Medal of Technology and
Innovation by President Barack Obama.
• Today DBMS's have revolutionized a lot .
DBMS:

7. Database architecture:
• The design of a DBMS depends on its architecture.
• There are mainly three levels of data abstraction:
• Internal Level or Actual PHYSICAL: Storage structure and access paths.
• Conceptual or Logical Level: Structure and constraints for the entire
database.
• External or View level: Describes various user views.

8. Database architecture:

9. Hierarchical Model
• In a Hierarchical database,
model data is organized in a
tree-like structure
• Data is represented using a
parent-child relationship
• Each entity has one parent and
many children
• Old and not used now
Models of DBMS:

10. Models of DBMS:
Network Model
• Data is represented in the form
of graph
• The network database model
allows each child to have
multiple parents
• Entities can be accessed through
several paths
• Old and not used now

11. Relational model
• Data are organized in two
dimensional tables (relations).
• Tables are related to each other.
• This model is based on
normalizing data in the rows and
columns of the tables.
• Relational DBMS is the most
widely used DBMS model
because it is one of the easiest.
Models of DBMS:

12. Advantages
Advantages & Disadvantages:
Disadvantages
• Cost of hardware and software.
• Cost of staff training.
• Technical staff.
• Database failure.
• Control data redundancy.
• Data consistency.
• Data sharing.
• Less storage.
• Data security.

13. Applications of database
• Banking.
• Airlines.
• Universities.
• Manufacturing.

14. Thanks
Any questions?