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Distributed Database Systems, 1st Edition by Chhanda Ray
book

Distributed Database Systems, 1st Edition by Chhanda Ray

by Chhanda Ray
May 2024
Intermediate to advanced content levelIntermediate to advanced
325 pages
12h 2m
English
Pearson India
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
Distributed Database Design
65
V1: Π
Project-id, branch-no, project-leader-id
(Project)
V2: Π
Project-id, Project-name, Project-type, amount
(Project).
Hence, primary key for the relation Project is Project-id, which is repeated in both vertical frag-
ments V1 and V2 to reconstruct the original base relation from the fragments.
Hence, vertical fragmentation also ensures the correctness rules for fragmentation.
Completeness – Each attribute in the relation Project appears either in fragment V1 or V2,
which satisfi es the completeness rule for fragmentation.
Reconstruction – The Project relation can be reconstructed from the vertical fragments V1
and V2 ...
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Publisher Resources

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