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Query Processing

Query Processing

Query Processing. Chapter 13: Query Processing. Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions. Basic Steps in Query Processing. Basic Steps in Query Processing. Parsing and translation

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562 views • 35 slides
External Sorting

External Sorting

External Sorting. Chapter 11. Why Sort?. A classic problem in computer science! Data requested in sorted order e.g., find students in increasing gpa order Sorting is first step in bulk loading B+ tree index.

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422 views • 18 slides
Achieving 10 Gb/s Using Xen Para-virtualized Network Drivers

Achieving 10 Gb/s Using Xen Para-virtualized Network Drivers

Achieving 10 Gb/s Using Xen Para-virtualized Network Drivers. Kaushik Kumar Ram*, J. Renato Santos + , Yoshio Turner + , Alan L. Cox*, Scott Rixner* + HP Labs *Rice University. Xen PV Driver on 10 Gig Networks. Throughput on a single TCP connection (netperf). Focus of this talk: RX.

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334 views • 18 slides
Evaluation of Relational Operations

Evaluation of Relational Operations

Evaluation of Relational Operations. Chapter 14, Part A (Joins). Relational Operations. We will consider how to implement: Selection ( ) Selects a subset of rows from relation. Projection ( ) Deletes unwanted columns from relation.

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263 views • 17 slides
Evaluation of Relational Operations

Evaluation of Relational Operations

Evaluation of Relational Operations. Chapter 14, Part A (Joins). Relational Operations. We will consider how to implement: Selection ( ) Selects a subset of rows from relation. Projection ( ) Deletes unwanted columns from relation.

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302 views • 17 slides

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