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Chapter 4 Parallel Sort and GroupBy

Chapter 4 Parallel Sort and GroupBy

Chapter 4 Parallel Sort and GroupBy. 4.1 Sorting, Duplicate Removal and Aggregate 4.2 Serial External Sorting Method 4.3 Algorithms for Parallel External Sort 4.4 Parallel Algorithms for GroupBy Queries 4.5 Cost Models for Parallel Sort 4.6 Cost Models for Parallel GroupBy 4.7 Summary

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589 views • 39 slides
Chapter 4 Parallel Sort and GroupBy

Chapter 4 Parallel Sort and GroupBy

Chapter 4 Parallel Sort and GroupBy. 4.1 Sorting, Duplicate Removal and Aggregate 4.2 Serial External Sorting Method 4.3 Algorithms for Parallel External Sort 4.4 Parallel Algorithms for GroupBy Queries 4.5 Cost Models for Parallel Sort 4.6 Cost Models for Parallel GroupBy 4.7 Summary

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393 views • 39 slides
Query Processing

Query Processing

Query Processing. Query Processing. Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions. Example DB. Basic Steps in Query Processing. 1. Parsing and translation 2. Optimization 3. Evaluation.

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519 views • 32 slides
External Sorting

External Sorting

External Sorting. 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. Sorting useful for eliminating duplicate copies in a collection of records (Why?)

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627 views • 21 slides
External Sorting

External Sorting

External Sorting. Problem: Sorting data sets too large to fit into main memory. Assume data are stored on disk drive. To sort, portions of the data must be brought into main memory, processed, and returned to disk. An external sort should minimize disk accesses. Model of External Computation.

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365 views • 19 slides

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