Sort Merge Joins Algorithm Assignment Help

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What is Sort Merge Joins algorithm?

Optimized sort merge join algorithm

1) Combine join with the merge phase of sort

2) Sort R and S in M runs of size Mon disk.

3) Merge and join the tuples in one pass.

Optimized two pass sort merge join algorithm

1) Cost: 3b( r ) + 3b( s )

2) Memory requirement: b( r ) + b( s ) <= m power 2

    - because we merge them in one pass

    - more efficient but more strict requirement.

Example of Sort Merge Joins algorithm

1) Cost of the sort is : A( logA )+ ( B logB ) + (A + B)

2) And the scanning of the cost is,  ( A + B ), could be ( A*B )

     - With ‘35’, ‘100’ or ‘300’ buffer pages, both can be sorted in 2 passes;

     - Total cost of the join is = 7500.