Distributed Databases Review. CS347 June 6, 2001. Fragmentation. How to partition relation into various pieces/fragments Types: Primary Horizontal Derived Horizontal Vertical Hybrid of the above possible Desiderata Completeness: don’t lose tuples Disjointness: no duplicate tuples
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June 6, 2001
Split R by attributes
Repeat key attribute in each vertical fragment
Attribute affinities define grouping
B (R) = B [ Ri | B Ai Ø]