Index join - PowerPoint PPT Presentation

Lecture 7: Query Execution and Optimization

Lecture 7: Query Execution and Optimization. Tuesday, February 20, 2007. Outline. Chapters 4, 12-15. DBMS Architecture. How does a SQL engine work ? SQL query  relational algebra plan Relational algebra plan  Optimized plan Execute each operator of the plan. Relational Algebra.

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Review

Review. Jun 5th, 2002. HW#5.2. R R.a = S.b S (52buffers). Join Result. R &amp; S. Input buffer for R. Output buffer. Input buffer for S. Page-Oriented Nested Loop Join. For each page in the outer relation R, we scan the entire inner relation S. Cost: M + M * N

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