Download Database System Concepts and Architecture

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Transcript
The Three-Schema Architecture
– The conceptual level has a conceptual schema describing the
structure of the whole database for a community of users.
– It hides the details of physical storage structures and
concentrates on describing entities, data types, relationships,
user operations, and constraints.
– A high-level data model or an implementation data model
can be used at this level.
– The external or view level includes a number of external
schemas or user views describing the part of the db that a
particular user group is interested in and hides the rest of the
db from that user group.
– A high-level data model or an implementation data model
can be used at this level.
Jan 29, 2002