Matakuliah
Tahun
Versi
: M0184 / Pengolahan Data Distribusi
: 2005
:
Session – 2
INTRODUCTION
OBJECTIVES
• CENTRALIZED VS DECENTRALIZED
• ADVANTAGE AND DISADVANTAGE OF CENTRALIZED
AND DECENTRALIZED SYSTEM
• IMPORTANCE OF INTEGRATED INFORMATION
SYSTEM AND HETEROGENITY OF DATA
DISTRIBUTION
CENTRALIZED SYSTEM
• SINGLE SITE/NODE LOCATION AND CONTROL BY
ONE COMPUTER
• EASY TO MANIPULATION DATA (UPDATE) AND
QUERY
• MAINTAIN BACKUP AND RECOVERY DATABASE
EASILY
• EASY TO CONTROL USER ACCESS THROUGH
DATABASE
Central Database on a Network
Site 1
Site 2
Site 5
DB
DB
Communication
Network
Site 4
Site 3
DECENTRALIZED SYSTEM
• DISPERSE SITES/NODES LINKED BY
COMMUNICATION NETWORKS
• QUERY OR UPDATE HELD BY SPECIFIC PROCESS
IN DISPERSE SITES AND CONTROLLED BY CERTAIN
SOFTWARE MODULE
• DATA LOCALIZATION
Distributed Database On a Network
Site 1
Site 2
Site 5
DB
Communication
Network
DB
Site 4
DB
Site 3
DB
INTEGRATING OTHER KINDS OF
INFORMATION
DIVERSITY OF INFORMATION
•
•
•
•
•
•
•
IMAGES
RULES
TEXT
VIDEO
RECORDS
GRPAHICS
DOCUMENTS
PRESSURE IN INTEGRATE DATA
• USER PRESSURE
• TECHNOLOGICAL PRESSURE
• DIFFICULTIES CAUSEB BY HETEROGENITY
USER PRESSURE
• DATA MAY STORE AT MANY SITE OF ENTERPRISE
FOR HISTORICAL REASON
• A DRIVING NEED FOR INTEGRATION TO HANDLE
CHANGE
• PROBLEMS ARISES FOR USER ORIENTED
REASONA IS IN ORGANIZATION CHANGES SUCH AS
CORPORATE MERGERS OR ACQUISITIONS
TECHNOLOGICAL PRESSURE
• EVOLVING DATABASE-RELATED TECHNOLOGY
• THE DESIRE TO GET BETTER MATCH FROM AMONG
AVAILABLE DBMS PACKAGES FOR A GIVEN
APPLICATION PROFILE
• THE REQUIREMENT FOR GREATER FLEXIBILITY OR
SOPHISTICATION OF SERVICES FROM SOFTWARE
PACKAGES
DIFICULTIES CAUSED BY HETEROGENITY
• AWARE WHEN ACCESS TO HETEROGENITY OF
LOCATION AND FORMAT OF DATA
• INCONSISTENCIES BETWEEN THE STYLES, UNIT
AND STRUCTURES