'Level index' diaporamas de présentation

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Rev. Sep 17, 2008. Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B + -Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access.

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Creating and Maintaining a Database

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CS 728 Advanced Database Systems Chapter 18

CS 728 Advanced Database Systems Chapter 18. Database File Indexing Techniques, B-Trees, and B + -Trees. Indexes as Access Paths. A single-level index is an auxiliary file that makes it more efficient to search for a record in the data file.

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CS4432: Database Systems II

CS4432: Database Systems II. Lecture #8 (Basic indexing). Professor Elke A. Rundensteiner. Indexing (Chapter 14 ). Indexing : helps to retrieve data quicker for certain queries value= 1,000,000 Select * FROM Emp WHERE salary = 1,000,000;. record. ?. value. Topics.

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7. Indexes

Section 7 # 1. Heap files allow record retrieval: by specifying the Record IDentifier, RID , or by scanning all records sequentially. Sometimes, retrieval of records by specifying the values in one or more fields is needed (semantic search or value-based querying), e.g.,

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7. Indexes

Heap files allow record retrieval: by specifying the Record IDentifier, RID , or by scanning all records sequentially. Sometimes, retrieval of records by specifying the values in one or more fields is needed (semantic search or value-based querying), e.g.,

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CSE 480: Database Systems

CSE 480: Database Systems. Lecture 20: Indexing Structures. Index. Mechanism to efficiently locate row(s) of a table without having to scan the entire table Analogous to a book index. Index entry. Indexing Field. An index is built based on an indexing field

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Lecture 8: Data structures for databases II

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Indexing

Indexing. Chapter Outline. Types of Single-level Ordered Indexes Primary Indexes Clustering Indexes Secondary Indexes Multilevel Indexes Dynamic Multilevel Indexes Using B-Trees and B+-Trees Indexes on Multiple Keys Index on SQL. Indexes as Access Paths.

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Index Structures

Index Structures. Chapter : Objectives. Types of Single-level Ordered Indexes Primary Indexes Clustering Indexes Secondary Indexes Multilevel Indexes Dynamic Multilevel Indexes Using B-Trees and B+-Trees Indexes on Multiple Keys. Indexes as Access Paths.

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Indexing Structures for Files

Indexing Structures for Files. Gang Qian Department of Computer Science University of Central Oklahoma. Overview (Chapter 18). Types of Single-level Ordered Indexes Primary Indexes Clustering Indexes Secondary Indexes Multilevel Indexes

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Indexes as Access Paths

Indexes as Access Paths. A single-level index is an auxiliary file that makes it more efficient to search for a record in the data file. The index is usually specified on one field of the file (although it could be specified on several fields)

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Chapter Outline

Chapter Outline. Indexes as additional auxiliary access structure Types of Single-level Ordered Indexes (ordered files) Primary Indexes Clustering Indexes Secondary Indexes Multilevel Indexes Dynamic Multilevel Indexes Using B-Trees and B+-Trees Indexes on Multiple Keys.

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Indexes as Access Paths

Indexes as Access Paths. A single-level index is an auxiliary file that makes it more efficient to search for a record in the data file. The index is usually specified on one field of the file (although it could be specified on several fields)

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Chapter 2

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Indexing Structures for Files

Indexing Structures for Files. Chapter Outline. Indexes as Access Paths Single Level Indexes Primary Indexes Clustering Indexes Secondary Indexes Properties of Index Types Multilevel Indexes Dynamic Multilevel Indexes Using B-Trees and B+-Trees Indexes on Multiple Keys.

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CSSE 230 Day 25

CSSE 230 Day 25. Skip Lists. Reminders/Announcements. Skip Lists. An alternative to balanced trees Sorted data. Random. Expected times are O(log n). An alternative to balanced trees. Indexed lists One-level index. 2nd-level index. 3rd-level index log-n-level index.

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THE PRINCIPLES OF MULTICRITERIAL REASONING OF THE DEVELOPMENT PRIORITIES Buracas & Zvirblis

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Indexing

Indexing. Lecture 15. HW#3 & Project. See course page for new instructions: submit source code and output of program on the given pairs of actors Can use unix machines (Makefile provided) Filenames/locations have changed Look at oracle info on course web page

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