1. Distributed Database Management System
Lecture 10

2. Virtual University of Pakistan
The functions in ANSI/SPARC Architecture
Square boxes represent processing functions
DB Administrator (responsible for Internal Schema
Enterprise Admin (Conceptual Schema)
Application Administrator (External Schema
May be same person
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3. Dimensions for DDBS Architecture
Autonomy
Distribution
Heterogeneity
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4. Virtual University of Pakistan
Heterogeneity:
Different component databases has a common thing that is represented by different way .
It must be difficult to handle.
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5. Architectural Alternatives
Autonomy (Tight Integration, SemiAutonomout, Total Isolation)
Distribution (No distribution, C/S, Peer to Peer)
Heterogeneity (Homogeneous, Heterogeneous)
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6. Virtual University of Pakistan

7. Virtual University of Pakistan
(A1, D0, H0), Semi Autonomous, No distribution, no heterogeneity. An environment where multiple instances of same DBMS installed on the same machine, and these instances
may belong to same or different organizations
agree to cooperate to form a federation
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8. Virtual University of Pakistan
(A0, D2, H0), No autonomy, peer to peer and homogeneous system.
Situation, when systems belong to same organization, of course multiple systems placed at different locations, since belong to same org. no heterogeneity and autonomy
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9. Virtual University of Pakistan
(A2, D2, H1)Maximum of Autonomy, maximum of distribution, and heterogeneous as well, Similar (A2, D1, H1)
Called Distributed Multidatabase
maximum het, why?
Most difficult architecture to manage
More of research interest*
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10. Thanks