Presentation #18
John Smith
Ch6 Network Design
Section 6.1-6.3.4 [p.166 ~ p.178-]
Review Questions
True/False
1. The heuristic approach Grouping, for the vertical
fragmentation of global relations starts by assigning each attribute to one
fragment, and at each step, joins some of the fragments until some criteria is
satisfied.
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Fill in the Blank
2. Generation of Clustered affinity matrix is done in three steps : ________ ,__________ and ________.
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Multiple choice
3. The _____ of the global relation's key in
the fragment is the characteristic of Vertical Fragmentation which allows
________ of the global relation.
a.
duplication, restructuring
b. replication,
reconstruction
c. multiplication,
building
d. unification, constructing
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