Question: Consider a grid file in which we wish to avoid overflow buckets
Consider 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.
Answer to relevant QuestionsConsider the account relation as shown below.a. Construct a bitmap index on the attributes branch-name and balance, dividing balance values into 4 ranges: below 250, 250 to below 500, 500 to below 750, and 750 and above.b. ...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?Suppose that a B + - tree index on branch-city is available on relation branch, and that no other index is available. List different ways to handle the following selections that involve negation? a. σ ¬ ((branch-city Suppose that a B+-tree index on (branch-name, branch-city) is available on relation branch. What would be the best way to handle the following selection? σ (branch-cityDecorrelation:a. Write a nested query on the relation account to find for each branch with name starting with “B”, all accounts with the maximum balance at the branch.b. Rewrite the preceding query, without using a ...
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