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Main memory buffers - PowerPoint PPT Presentation

Outline

Outline

The Skyline Operator (Stephan Borzsonyi, Donald Kossmann, Konrad Stocker) Presenter: Shehnaaz Yusuf March 2005. Outline. Introduction Examples of Skyline SQL Extensions SQL Example Skyline Exercise Implementation : Algorithms Conclusion. Introduction.

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555 views • 38 slides
Equality Join R X R.A=S.B S

Equality Join R X R.A=S.B S

Equality Join R X R.A=S.B S. Pr records per page. Ps records per page. M Pages . N Pages . :. :. Relation S. Relation R. Simple Nested Loops Join. Memory. For each tuple r in R do for each tuple s in S do if r.A == S.B then add <r, s> to result. 1 page for R.

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453 views • 32 slides
External Sorting

External Sorting

External Sorting. Chapter 13. 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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456 views • 32 slides
CSCE 310 / 608 Database Systems

CSCE 310 / 608 Database Systems

CSCE 310 / 608 Database Systems. Chapter 15: Query Execution. Query Processing. Query Execution One-Pass Algorithms. One Pass, Binary Operations. Bag union: copy every tuple of R to the output, then copy every tuple of S to the output only needs M ? 1

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424 views • 32 slides
Query Execution

Query Execution

Query Execution. Where are we?. File organizations: sorted, hashed, heaps. Indexes: hash index, B+-tree Indexes can be clustered or not. Data can be stored in the index or not. Hence, when we access a relation, we can either scan or go through an index: Called an access path.

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335 views • 25 slides
Chapter 15.7 Buffer Management

Chapter 15.7 Buffer Management

Chapter 15.7 Buffer Management. ID: 219 Name: Qun Yu Class: CS257 219 Spring 2009 Instructor: Dr. T.Y.Lin. What does a buffer manager do?. Assume there are M of main-memory buffers needed for the operators on relations to store needed data. In practice: rarely allocated in advance

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1.14k views • 21 slides
Chapter 15.7 Buffer Management

Chapter 15.7 Buffer Management

Chapter 15.7 Buffer Management. ID: 219 Name: Qun Yu Class: CS257 219 Spring 2009 Instructor: Dr. T.Y.Lin. What does a buffer manager do?. Assume there are M of main-memory buffers needed for the operators on relations to store needed data. In practice: rarely allocated in advance

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362 views • 21 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
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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307 views • 12 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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351 views • 12 slides
External Sorting

External Sorting

External Sorting. Chapter 13. Modified by Donghui Zhang Jan 30, 2006. 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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284 views • 9 slides

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