'Query rewrite predicate movearound' diaporamas de présentation

Lecture 14: Query Optimization

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Lecture 14: Query Optimization

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Query Optimization

Query Optimization. Query Optimization Process (simplified a bit). Parse the SQL query into a logical tree: identify distinct blocks (corresponding to nested sub-queries or views). Query rewrite phase: apply algebraic transformations to yield a cheaper plan.

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Lecture #8 November 16 th , 2000

Lecture #8 November 16 th , 2000. Query Optimization The Next-to-last Frontier. Administration. Last homework handed out by the weekend. Projects? Project demos: Dec. 4-6. Project reports due Dec. 4 th . The (short) Toronto story. Outer joins. Query Optimization. Goal:.

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Query Optimization

Query Optimization. Query Optimization Process (simplified a bit). Parse the SQL query into a logical tree: identify distinct blocks (corresponding to nested sub-queries or views). Query rewrite phase: apply algebraic transformations to yield a cheaper plan.

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Query Optimization: Transformations

Query Optimization: Transformations. May 29 th , 2002. Schema for Some Examples. Sailors ( sid : integer , sname : string, rating : integer, age : real) Reserves ( sid : integer, bid : integer, day : dates , rname : string). Reserves:

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