Explain the distinction between closed and open hashing. Discuss the relative merits of each technique in database applications.
Answer to relevant QuestionsWhat are the causes of bucket overflow in a hash file organization? What can be done to reduce the occurrence of bucket overflows?Why is a hash structure not the best choice for a search key on which range queries are likely?What are the advantages and disadvantages of hash indices relative to B+-tree indices? How might the type of index available influence the choice of a query processing strategy?The hash join algorithm as described in Section computes the natural join of two relations. Describe how to extend the hash join algorithm to compute the natural left outer join, the natural right outer join and the natural ...Show how to derive the following equivalences by a sequence of transformations using the equivalence rules in Section 14.3.1. a. σθ1 ∧ θ2 ∧ θ3 (E) = σθ1 (σθ2 ...
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