Database Fragmentation

1. PRESENTATION
ON
Database Fragmentation

2. Views about this statement
A transaction can be executed by multiple
networked computers in a unified manner.

3. DDBMS ?
To understand DDBMS…..
o Database
o DBMS

4. DDBMS

5. Database Fragmentation

6. Data Fragmentation
“Data fragmentation allows you to break a single
object into two or more segments.”
The object might be:-
o User’s database.
o System database.
o A table

7. Why Fragments ?
Usage
Efficiency
Security
Parallelism

8. Storage of Fragments in DDBMS
Each fragment can be stored at any site over
network .
Information about data fragmentation is stored
in (DDC) .
DDC is accessed by the TP to process user
requests .

9. Types of Data Fragmentation
Horizontal fragmentation
Vertical fragmentation
Mixed fragmentation

11. Horizontal Fragmentation:
XYZ Company’s management requires
information about its customers in all three
states.
States are:-
TN
FL
GA
Requirement:-
Data regarding local customers only.

12. Horizontal Fragmentation:

13. Horizontal Fragmentation:

14. Vertical Fragmentation
Company’s management requires information
about its customers in Two Departments.
Two departments: the service department and
the collections department.
Each department has an interest in only a few of
the CUSTOMER table’s attributes .

15. Vertical Fragmentation

16. Vertical Fragmentation

17. Mixed Fragmentation
Company’s structure requires that the
CUSTOMER data be fragmented horizontally to
accommodate the various company locations.
Within the locations, the data must be
fragmented vertically to accommodate the two
departments.

20. Advantages of Fragmentation
Reflects organizational structure
Improved share ability and local autonomy
Improved availability
Improved reliability
Improved performance
Economics

21. Limitations of Fragmentation
Complexity
Cost
Security
Integrity control more difficult
Lack of standards
Lack of experience
Database design more complex

23. Bibliography

25. Presented By:
Ravisha Sethi