Rdbms

NADAR SARASWATHI COLLEGE
OF ARTS AND
SCIENCE

Data base management
system
A database management system is a software
package designed to define, manipulate,
retrieve and manage data in a database.
A DBMS generally manipulates the data
itself, the data format, field names, record
structure and file structure.

Database Vs File
System
A database is generally used for storing
related, structured data, with well define data
formats, in an efficient manner for insert,
update and or retrieval .
A file system is a more unstructured data
store for storing arbitrary, probably unrelated
data.

Data Definition Languages
DDL used to define database structure or
pattern.
It is used to create schema, tables, indexes,
constraints, etc. in the database.
Using the DDL statements, you can create
the skeleton of the database.
Tasks: Create, Alter, Drop,Truncate,Rename

Data manipulation language
Select: It is used to retrieve data from a
database.
Insert: It is used to insert data into a table.
Update: It is used to update existing data
within a table.
Delete: It is used to delete all records from a
table.

Data Control Languages
It is used to retrieve the stored or saved data.
The DCL execution is transactional. It also
has rollback parameters.
Grant: It is used to give user access
privileges to a database.
Revoke: It is used to take back permissions
from the user.

Transaction Control
Languages
TCL is used to run the changes made by the
DML statements. TCL can be grouped into a
logical transaction.
Commit: It is used to save the transaction on
the database.
Rollback: It is used to restore the database to
original since the last commit.

Applications of DBMS
Airlines and Railways
Banking
Education
Telecommunication
E-Commerce
Human resources

Entity Relational Model
An entity relationship model describes
interrelated tings of interest in a specific
domain of knowledge.
A basic ER model is composed of entity
types and specifies relationships that can
exist between entities.

Conclusion
Hybrid is good
Map Reduce takes care “rack to cluster”
Not sure how good it is for text analytical
tasks.
RDBMS often problems with data skew

Rdbms

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