Matakuliah
Tahun
Versi
: M0184 / Pengolahan Data Distribusi
: 2005
:
Session - 21
DISTRIBUTED DATABASE DESIGN AND
ADMINISTRATION
DISTRIBUTED DATABASE
DESIGN
OBJECTIVES
• Software life cycle
• The design of the global conceptual
schema
• Logical design for distributed database
Software Life Cycle
• Careful analysis of the feasibility and potential of the
proposed software system is carried out
• Requirement collection and analysis phase involves
extensive discussion between designer and end-user
• The design phase involves the detailed design of the
system
• During the implementation phase, the system is fully
implemented and tested
• Evaluating the newly developed system against those
requirements
• Operational phase
Logical Design for Distributed
database
Global Enterprise Model
Schema Integrator
Local Participant Schema
Global Conceptual
Schema
Schema Integration
• Schema integration is relatively recent concept,
relating specifically to the problems associated
with DDBs
• The integration of a set of pre-existing local
schema into single global schema
• Requires a semantically rich data model 
using subset of another entity (Example : patient
is of outpatient)
• The ability of define subset called Generalization
Subset Entity
Test
Result
Out
Patient
Name
Person
Number
Children
CName
CNumber
Address
Married
Consultant
Referral
Diagnosis
Patient
Interoperability Without using
Global Schema
• In Heterogeneous environment, construction of
global schema can be too onerous task
• A global schema essential for tight integration
between DB, where loosely-constructed
federation may not be worthwhile.
• Logical DDB design effort goes to export
schema
• The export schema represent view defined over
part of the DDB only
• User define their own views at run-time using
powerful query language
Object Oriented approach to
schema Integration
• Object oriented is semantically rich data model
• Method can be used to provide powerful
integration functions
• Provides the possibility of reuse by global user
of local application program
• The integration of multimedia DB
• Equally applicable whether or not a global
schema is used