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 Query Processing
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195
projection and join operations. The reconstruction rule for mixed fragmentation uses union opera-
tions and join operations of fragments. All reduction techniques that are used for horizontal, verti-
cal and derived fragmentation can be used for mixed fragmentation. These reduction techniques
are summarized below:
Removal of empty relations that can be produced by contradicting selection predicates on
horizontal fragments.
Removal of useless relations that can be produced by applying projection operations on
vertical fragments.
Removal of useless join operations that can be produced by distributing join operations ...
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