Distributed Database Management Systems: Lecture 10

Distributed Database
Management System
Lecture 10


• 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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Dimensions for DDBS Architecture
•

Autonomy

•

Distribution

•

Heterogeneity

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Heterogeneity:
Different component
databases has a common thing
that is represented by different
way .
It must be difficult to handle.

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Architectural Alternatives
• Autonomy (Tight Integration,
SemiAutonomout, Total Isolation)
• Distribution (No distribution, C/S,
Peer to Peer)
• Heterogeneity (Homogeneous,
Heterogeneous)
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• (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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• (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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• (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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Thanks