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CS222 P : Principles of Data Management UCI, Fall 2018 Notes # 13 Query Optimization (System-R)

CS222 P : Principles of Data Management UCI, Fall 2018 Notes # 13 Query Optimization (System-R)

CS222 P : Principles of Data Management UCI, Fall 2018 Notes # 13 Query Optimization (System-R). Instructor: Chen Li. System R Optimizer. Impact: Most widely used currently; works well for < 10 joins. Cost estimation: An approximate art at best ( ?).

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229 views • 22 slides
Instructor: Chen Li

Instructor: Chen Li

CS222 /CS122C : Principles of Data Management UCI, Fall 2018 Notes # 13 Query Optimization (System-R). Instructor: Chen Li. System R Optimizer. Impact: Most widely used currently; works well for < 10 joins. Cost estimation: An approximate art at best ( ?).

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245 views • 22 slides
Relational Query Optimization

Relational Query Optimization

Relational Query Optimization. Chapter 15. Highlights of System R Optimizer. Impact: Most widely used currently; works well for < 10 joins. Cost estimation: Approximate art at best. Statistics, maintained in system catalogs, used to estimate cost of operations and result sizes.

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203 views • 19 slides
Relational Query Optimization

Relational Query Optimization

Relational Query Optimization. Chapters 14. Query Blocks: Units of Optimization. SELECT S.sname FROM Sailors S WHERE S.age IN ( SELECT MAX (S2.age) FROM Sailors S2 GROUP BY S2.rating ).

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263 views • 18 slides
Relational Query Optimization II: Size Estimation and Plan Generation

Relational Query Optimization II: Size Estimation and Plan Generation

Relational Query Optimization II: Size Estimation and Plan Generation. Size Estimation and Reduction Factors. SELECT attribute list FROM relation list WHERE term1 AND ... AND termk. Consider a query block:

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130 views • 11 slides

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