Slide 1 introduction to dbms

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

WELCOME

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

Introduction To Database

• Data

• Information

• Knowledge

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

Need for Information

• Addition Knowledge

•Decision making

• Can apply in different levels

• Increase in Productivity

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

DATABASE

• Inter related data with controlled redundancy

• used by different people

• Independent

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

Why Database ????(advantages over traditional file systems)

1. Centralized control2. Redundancy can be reduced3. Inconsistency can be avoided4. Data can be shared5. Standard can be enforced6. Security restriction can be applied7. Integrity can be maintained8. Conflicting requirements can be balanced

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

1. Centralized control:

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

2. Redundancy can be reduced:

Note: Sometimes redundancy is allowed (Because of some technical & business reasons we need to store multiple data )

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

3. Inconsistency can be avoided

4. Data Can be shared

5. Standard can be enforced6. Security restriction can be applied7. Integrity can be maintained

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

8. Conflicting requirement can be balanced

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

CHARACTERISTICS OF DATA IN DATABASE

•Shared•Persistence : It means the data exist permanently ,beyond the scope of the process•Validity/Integrity/Correctness•Security•Consistency•Non- redundancy•Independence : ( we will discuss it later)

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

TYPES OF DATABASE

Centralized

Distributed

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

DATA BASE MANAGEMENT SYSTEM

•It is a collection of programs that enables you to store ,modify data and extract information from a database. •It varies from small to large•It is a piece of software that provides services for accessing a database

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

COMPONENTS OF DBMS

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

•Transaction Management

•Concurrency Control

Data Item

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

•Recovery Management• Return to a consistent state

•Security Management• Protection against unauthorized access• Different privileges

•Language Interface• Data structure creation : DDL• Manipulation of data : DML

•Storage Management• Permanent storage

Prepared by Visakh V, Assistant Professor,Dept. of CSE, LBSITW

•Data Catalog Management• Also known as data dictionary• contains metadata• Helpful to know the structure