Lecture 1. Introduction

Data integrity in DB

Data integrity is supporting a variety of restrictions on data in database

The following causes integrity violation:

Faults in hardware or software

Incorrect data entering, modifications and

deletions

Concurrent data access and modifications

Lecture 1. Introduction

Features of DB Integrity Supporting

Back-up coping and restoring

Checkpoints and rollbacks

Integrity constraints

Transactions

Locking

Logs activity

Lecture 1. Introduction

Data Security

User registration

Control of access rights

User identification

Automatic logging

Data encryption

Lecture 1. Introduction

DBMS Languages

Data Definition language (DDL)

Data Manipulation Language (DML)

Query Language (QL)

Structured Query Language (SQL)

Query By Example (QBE)

Lecture 1. Introduction

Data Base Users

DB administrator (group)

System analytics and designers

System and applied programmers

End users

Operators

Lecture 1. Introduction

Requirements to DB (1)

Simplicity and flexibility of applications development

Multiple-aspect data usage

Simplicity and flexibility of data usage

Simplicity and flexibility of data changes, modifications and adjustemts

Efficiency, flexibility and productivity of storage and processing

Lecture 1. Introduction

Requirements to DB (2)

Protection against the non-authorized access, distortion and deletion

Support of a required level of the data independence

Support a required level of the data integrity

Advanced DB administration features