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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

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Distributed Databases

  • 2. OVERVIEW OF PRESENTATION  INTRODUCTION TO DISTRIBUTED DBMS.  FEATURES OF DISTRIBUTED DATABASE.  DISTRIBUTED DATABASE MANAGEMENT SYSTEM.  FACTORS AFFECTING DDBMS.  ADVANTAGE & DISADVANTAGE
  • 4. 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.
  • 5. 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.
  • 7. 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.
  • 8. 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.
  • 9. 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.