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Evaluation of Relational Operations

Evaluation of Relational Operations. Notation. M = Memory allocated for pages T R = # of tuples in R. b R = # of tuples of R per page. B R = # of pages (blocks) occupied by R. b = # of bytes per page. I R.A = Image of attribute A in R = # of distinct values of A in R.

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Join Algorithms

Join Algorithms. Query Processing: Lecture 1. Joins With One Join Column. SELECT * FROM Reserves R1, Sailors S1 WHERE R1.sid=S1.sid. In algebra: R S. Common! Must be carefully optimized. R S is large; so, R S followed by a selection is inefficient.

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Hash join superior - PowerPoint PPT Presentation

Evaluation of Relational Operations

Join Algorithms