Query trees - PowerPoint PPT Presentation

Distributed Databases

Distributed Databases. Fragmentation vs Query optimization. Query Processing Steps. Decomposition Given SQL query, generate one or more algebraic query trees Localization Rewrite query trees, replacing relations by fragments Optimization

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669 views • 46 slides

Chapter 15

Chapter 15. Algorithms for Query Processing and Optimization. Translating SQL Queries into Relational Algebra. Algorithms for External Sorting. Algorithms for SELECT and JOIN Operations. Implementing the SELECT Operation Implementing the JOIN Operation.

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151 views • 13 slides

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