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Uploaded byMeghaj Mallick
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Distributed Databases

The document provides an overview of Distributed Database Management Systems (DDBMS), defining distributed databases as interconnected databases spread across various locations. It highlights key features, factors affecting DDBMS, and lists advantages such as modular development and reliability, as well as disadvantages like the need for complex software and potential processing overhead. Overall, DDBMS allows for unified database management despite physical separation of data.

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BY MEGHAJ KUMAR MALLICK MCA/25017/18 1ST YEAR 2ND SEMESTER
OVERVIEW OF PRESENTATION  INTRODUCTION TO DISTRIBUTED DBMS.  FEATURES OF DISTRIBUTED DATABASE.  DISTRIBUTED DATABASE MANAGEMENT SYSTEM.  FACTORS AFFECTING DDBMS.  ADVANTAGE & DISADVANTAGE
INTRODUCTION TO DISTRIBUTED DBMS
DEFINITION  A distributed database is a collection of multiple interconnected databases, which are spread physically across various locations that communicate via a computer network.  A distributed DBMS manages the distributed database in a manner so that it appears as one single database to users.
FEATURES OF DISTRIBUTED DATABASE  Data is physically stored across multiple sites. Data in each site can be managed by a DBMS independent of the other sites.  The processors in the sites are connected via a network. They do not have any multiprocessor configuration.  A distributed database is not a loosely connected file system.
DISTRIBUTED DBMS
DEFINITION OF DDBMS  A distributed database management system (DDBMS) is a centralized software system that manages a distributed database in a manner as if it were all stored in a single location.  It is used to create, retrieve, update and delete distributed databases.  It synchronizes the database periodically and provides access mechanisms by the virtue of which the distribution becomes transparent to the users.
FACTORS AFFECTING DDBMS  Distributed Nature of Organizational Units.  Need for Sharing of Data .  Support for Both OLTP and OLAP.  Database Recovery.  Support for Multiple Application Software.
ADVANTAGE & DISADVANTAGE ADVANTAGE DISADVANTAGE  Modular Development.  More Reliable.  Better Response.  Lower Communication Cost .  Need for complex and expensive software.  Processing overhead.  Data integrity.  Overheads for improper data distribution.
Distributed Databases