Session - 21 DISTRIBUTED DATABASE DESIGN AND ADMINISTRATION DISTRIBUTED DATABASE DESIGN Matakuliah: M0184 / Pengolahan Data Distribusi Tahun: 2005 Versi:

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 Consultant Referral Person Patient Name Number Address Married Children CName CNumber Diagnosis

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