Distributed Database Management Systems: Lecture 1

Distributed Database Management Systems: Lecture 1. The main topics covered in this chapter include: introduction to database and distributed systems in general; architectures and design issues of DDBS; technological treatment; theoretical aspects of the topic;...

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Distributed Database Management Systems

Lecture - 01

1­Distributed Database Systems (2 nd   Edition) by T.M., Ozsu, P. Valdusiez

2­ Distributed Database Systems. 

  By D. Bell, J. Grimson, Addison­

Wesley, 1992 

References

3­ Distributed Systems: Concepts and   

Design, 4 th  Edition,  by G. Coulouris, 

J. Dollimore, T. Kindberg, Addison­ Wesley

Prerequisites:  Database Management  Systems, Computer Networks 

 Introduction to database and Distributed  Systems in general

 Architectures and Design Issues of 

DDBS

 Technological Treatment

 Theoretical Aspects of the topic

Traditional File Processing 

System: the very first form of  business data processing 

description that it manipulates

Registration Applications

Registration Data Files

Registration

Examination Applications

Examination

Data Files

Examination

Library

Applications

Library

Data

Files

Library

Library Exam Registration

Reg_Number Reg_Number Reg_Number

Father Name Address Father Name

File Processing Systems

Duplication of Data Vulnerable to Inconsistency

  Database Approach: (Also called 

centralized database) Database is a  shared collection of logically related  data

Data Description Data

Manipulation

….

PROGRAM 1

PROGRAM 2

PROGRAM 3

Database Approach

Takes care of all major drawbacks of File System Environment plus more

A number of autonomous processing  elements that are connected through a  computer network and that cooperate 

in performing their assigned tasks

computers to coordinate and share 

– Processing logic

– Functions

– Data

– Control; All are relevant and important here

– How closely systems are connected – May be the measured as ratio of 

messages interchanged to the local  processing

– Could be Weak (over the network) or  Strong (if components are shared)

– Could be point to point or a common 

interconnection channel

Structures; more reliable and 

responsive

Standards

Design