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Suppose relation r is stored partitioned and indexed on A , and s is stored partitioned and indexed on B . Consider the query: r
Suppose relation r is stored partitioned and indexed on A and s is stored partitioned
and indexed on B Consider the query: rCgamma countsDsigma ArrBsB
s
i Give a parallel query plan using the exchange operator, for computing the
subtree of the query involving only the select and join operators.
ii Now extend the above to compute the aggregate. Make sure to use preaggregation
to minimize the data transfer.
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