Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 22 Sep 2017 My Price 3.00

decomposition of R

1.Let R be a relation schema with a set F of FDs. Prove that the decomposition of R into R1 and R2 is lossless-join if and only if F+ contains R1 ∩ R2 → R1 or R1 ∩ R2 → R2.

2.Consider a scheme R with FDs F that is decomposed into schemes with attributes X and Y. Show that this is dependency-preserving if F ⊆ (FX ∪FY )+.

3.Prove that the optimization of the algorithm for lossless-join, dependency preserving decomposition into 3NF relations (Section 19.6.2) is correct.

4.Prove that the 3NF synthesis algorithm produces a lossless-join decomposition of the relation containing all the original attributes.

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Maurice Tutor
(5)
Status NEW Posted 22 Sep 2017 09:09 PM My Price 3.00

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