Engineering, 25.04.2020 03:44 nsgtritent
Suppose we store a relation R (x, y) in a grid file. Both attributes have a range of values from 0 to 1000. The partitions of this grid file happen to be uniformly spaced; for x there are partitions every 20 units, at 20, 40, 60, and so on, while for y the partitions are every 50 units, at 50, 100, 150, and so on.
Required:
a. How many buckets do we have to examine to answer the range query?
b. We wish to perform a nearest-neighbor query for the point (110, 205). We begin by searching the bucket with lower-left corner at (100, 200) and upper-right corner at (120, 250), and we find that the closest point in this bucket is (115, 220). What other buckets must be searched to verify that this point is the closest?
Answers: 3
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Suppose we store a relation R (x, y) in a grid file. Both attributes have a range of values from 0 t...
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