'External merge sort' presentation slideshows

Implementation of Relational Operations

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Implementation of Relational Operations

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Database Systems ( ????? )

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Chapter 13: 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. 1. Parsing and translation 2. Optimization 3. Evaluation. Basic Steps in Query Processing (Cont.).

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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 First step in bulk loading B+ tree index. Useful for eliminating duplicates (Why?) Useful for summarizing groups of tuples

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Database Systems ( ????? )

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Carnegie Mellon Univ. Dept. of Computer Science 15-415/615 - DB Applications

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Query Execution in Databases: An Introduction

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Query Processing 2: Sorting & Joins

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Query Processing 1: Joins and Sorting

Query Processing 1: Joins and Sorting. R&G, Chapters 12, 13, 14 Lecture 8. One of the advantages of being disorderly is that one is constantly making exciting discoveries. A. A. Milne. Administrivia. Homework 1 Due Tonight You must be in groups of 3 to submit

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Bitmap Indexing

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CAS CS 460/660 Introduction to Database Systems Query Evaluation I

CAS CS 460/660 Introduction to Database Systems Query Evaluation I. Slides from UC Berkeley. Query Optimization and Execution. SQL Query. Relational Operators. Files and Access Methods. Buffer Management. Disk Space Management. DB. Introduction.

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Query Processing

Query Processing. Steps in Query Processing. Validate and translate the query Good syntax. All referenced relations exist. Translate the SQL to relational algebra. Optimize Make it run faster. Evaluate. Translation Example. Possible SQL Query: SELECT balance FROM account

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General External Merge Sort

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Database Systems ( ????? )

Database Systems ( ????? ). November 29, 2004 Lecture #12 By Hao-hua Chu ( ??? ). Announcement. Next week reading: Chapter 14 Assignment #8 is out on the course homepage. Graded Assignment #6 & midterm exams are ready for pickup.

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Query Processing

Query Processing. CS 405G Introduction to Database Systems. Overview. Many different ways of processing the same query Scan? Sort? Hash? Use an index? All have different performance characteristics and/or make different assumptions about data Best choice depends on the situation

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External Sorting

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External Sorting

External Sorting. R & G Chapter 11. One of the advantages of being disorderly is that one is constantly making exciting discoveries. A. A. Milne. Why Sort?. A classic problem in computer science! Data requested in sorted order e.g., find students in increasing gpa order

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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?)

306 views • 12 slides

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?)

351 views • 12 slides