May 2024
Intermediate to advanced
325 pages
12h 2m
English
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
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Distributed Database Systems
Employee relation using the same fragmentation strategy of the Department relation. This can
be achieved by derived fragmentation strategy that partitions the Employee relation horizontally
according to the deptno as follows:
Ci Employee ԙ
deptno
Pi, 1 i 3
It can be shown that derived fragmentation also satisfi es the correctness rules of fragmentation.
Completeness – Since the predicate of the derived fragmentation involves two relations,
it is more diffi cult to ensure the completeness rule for derived fragmentation. In the above
example, each tuple of Department relation must appear either in fragments P1, ...
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