Why is a hash structure not the best choice for a search key on which range queries are likely?
Answer to relevant QuestionsConsider a grid file in which we wish to avoid overflow buckets for performance reasons. In cases where an overflow bucket would be needed, we instead reorganize the grid file. Present an algorithm for such a reorganization.Consider the following SQL query for our bank database select T.branch-name from branch T, branch S where T.assets > S.assets and S.branch-city = “Brooklyn” Write an efficient relational-algebra expression that is ...The 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? ...Suppose that a B+-tree index on branch-city is available on relation branch, and that no other index is available. What would be the best way to handle the following selections that involve negation? a. σ ¬ ...A set of equivalence rules is said to be complete if, whenever two expressions are equivalent, one can be derived from the other by a sequence of uses of the equivalence rules. Is the set of equivalence rules that we ...
Post your question