Reznichenko Valery

Organization of data and knowledge bases

Lecture.1 Introduction

National Aviation University Computer Sciences Faculty Department of software engineering

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Lecture 1. Introduction

CONTENTS

File systems and data bases

Definitions of DB and DBMS

Advantages of DB usage

DBMS languages

DBMS users

Basic requirements to database systems

Lecture 1. Introduction

File Systems

AD

Lecture 1. Introduction

File System Drawbacks

Data depends on programs

Inflexibility of data structure

Static data

Absence of integration

Data inconsistency

Inefficient concurrent access

Inefficient storage and processing

Lecture 1. Introduction

Data Base Approach

Lecture 1. Introduction

Data Base Definition

The database (DB) is a large set of complex- structured data, that assume:

the integrated storage,

centralized management and

sharing.

Lecture 1. Introduction

DBMS Definition

Data Base Management System (DBMS) is a

software for EFFECTIVE, CONVENIENT, and SAFETY creation and maintenance of data in a database, for organization of search data and outputing them.

Lecture 1. Introduction

DB Advantages

Integrated data storage

Centralized management

Common usage (sharing)

Data independence

Data integrity

Data security

Effective data access management

Data recovery

Lecture 1. Introduction

Centralized DB Management

DB schema design

Development data storage structures

DB restructuring and reorganization

Supporting DB back-up and recovery mechanisms

Data protection mechanisms

DB Adjustments

Regular observations

Lecture 1. Introduction

Data Independence in DB

The data independence is a status, when the application programs are completely independent from data storage, access and representation

Logical independence

Physical independence