Estimate the number of block accesses required by your solution to Exercise for r1 Θ r2, where r1 and r2 are as defined in Exercise.
Answer to relevant QuestionsThe indexed nested-loop join algorithm described in Section 13.5.3 can be inefficient if the index is a secondary index, and there are multiple tuples with the same value for the join attributes. Why is it inefficient? ...Clustering indices may allow faster access to data than a nonclustering index affords. When must we create a nonclustering index, despite the advantages of a clustering index? Explain your answer.For each of the following pairs of expressions, give instances of relations that show the expressions are not equivalent. a. ΠA(R − S) and Π A (R) – ΠA (S) b. σB < 4(AGmax(B)(R)) and ...Give an example of an expression defining a materialized view and two situations (sets of statistics for the input relations and the differentials) such that incremental view maintenance is better than recomputation in one ...Since every conflict-serializable schedule is view serializable, why do we emphasize conflict serializability rather than view serializability?
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