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2 0 Points ) Consider a relation R ( A , B , C ) . Assume that the only index on relation R is
Points Consider a relation R A B C Assume that the only index on relation R is
an unclustered Btree on attribute A The Btree has height and are all in memory.
Btree data entries are also in memory. R has tuples in pages. The
values of attribute A are uniformly distributed from to Now consider the following
query:
SELECT A B
FROM R
WHERE A val
Compute the minimum value of val such that the most efficient way of executing the
above query is to use the Btree index. Assume that the cost metric is the number of
page IOs
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