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Consider the natural join of the relation R(A, B)and S(A, C)on attribute A. Assume that R and S have 80000 and 20000 blocks, respectively and

Consider the natural join of the relation R(A, B)and S(A, C)on attribute A. Assume that R and S have 80000 and 20000 blocks, respectively and there are 10 buffer blocks available in the main memory. Describe the optimized sort-merge join algorithm to join these two relations andcompute its cost. The cost of a join is the number of its block I/Os accesses.

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