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Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→a, ab→d, a→b, d→c}, i.e. what are all of the FDs implied by F (Hint; there's 24 of them).
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Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
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Explain four causes for failures in data warehouse projects
Consider the entity type dependent related to employee entity, which is used to keep track of the dependents of every employee. The attributes of dependents are: name, sex, birth d
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