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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 Query Processing
191
11.3.2 Query Fragmentation
In query fragmentation phase a relational algebraic query on global relations is converted into an
algebraic query expressed on physical fragments, called a fragment query, considering data distribu-
tion in the distributed database. A global relation can be reconstructed from its fragments using the
reconstruction rules of fragmentation [as described in Chapter 5, Section 5.3.2]. For horizontal frag-
mentation, the reconstruction rule is the union operation of relational algebra, and for vertical frag-
mentation the reconstruction rule is the join operation of relational algebra. Thus, ...
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