Distributed Database Management Systems: Lecture 10. The main topics covered in this chapter include: the functions in ANSI/SPARC architecture; square boxes represent processing functions; DB administrator responsible for internal schema; enterprise admin (conceptual schema);...
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Lecture 10
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• 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
SemiAutonomout, Total Isolation)
Peer to Peer)
Heterogeneous)
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No distribution, no heterogeneity
An environment where multiple
instances of same DBMS installed
on the same machine, and these instances
organizations
federation
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to peer and homogeneous
system
same organization, of course
multiple systems placed at
different locations, since belong to same org no heterogeneity and
autonomy
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Autonomy, maximum of
distribution, and heterogeneous
as well, Similar (A2, D1, H1)
manage
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