'Index entry' diaporamas de présentation

Reading and Review Chapter 12: Indexing and Hashing

Reading and Review Chapter 12: Indexing and Hashing. 12.1 Basic Concepts 12.2 Ordered Indices 12.3 B+-tree Index Files lots of stuff 12.4 B-tree Index Files 12.5 Static Hashing lots of stuff 12.6 Dynamic Hashing (Extendable Hashing) lots of stuff

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Database Internals

Database Internals. Zachary Ives CSE 594 Spring 2002 Some slide contents by Raghu Ramakrishnan. Database Management Systems. API/GUI. (Simplification!). Query. Optimizer. Stats. Physical plan. Exec. Engine. Logging, recovery. Schemas. Catalog. Data/etc. Requests.

1.05k views • 70 slides

Index Basic Concepts

Index Basic Concepts. Indexing mechanisms used to speed up access to desired data. E.g., author catalog in library Search Key - attribute to set of attributes used to look up records in a file. An index file consists of records (called index entries ) of the form

1.12k views • 57 slides

B + Review

B + Review. Index Entries. (Direct search). Data Entries. ("Sequence set"). B+ Tree: Most Widely Used Index. Insert/delete at log F N cost; keep tree height-balanced . (F = fanout, N = # leaf pages)

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Indexing and Execution

Indexing and Execution. May 20 th , 2002. Indexing - Recap. Primary file organization: heap, sorted, hashed. Primary vs. secondary Clustered vs. unclustered Dense vs. sparse Composite search key indexes. Not all combinations are possible. Next: B+-trees. Tree-Based Indexes.

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Index structures

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Database Systems ( ????? )

Database Systems ( ????? ). November 29/30, 2006 Lecture #8. Announcement. Next week reading: Chapter 11 Hash-based Index Assignment #3 is due next week. Midterm exams are graded. Tree-Structured Indexing. Chapter 10. Outline. Motivation for tree-structured indexes ISAM index

527 views • 43 slides

Data Indexing

Data Indexing. Herbert A. Evans. Purposes of Data Indexing . What is Data Indexing? Why is it important?. Concept of File Systems. Stores and organizes data into computer files. Makes it easier to find and access data at any given time. . Database Management Systems.

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Data Organization - B-trees

Data Organization - B-trees. A simple index. Index file. Brighton A-217 700 Downtown A-101 500 Downtown A-110 600 Mianus A-215 700 Perry A-102 400. A-101 A-102 A-110 A-215 A-217. Index of depositors on acct_no.

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Blocking It Out: Breaking (PCT)Free from Chains

Blocking It Out: Breaking (PCT)Free from Chains. Philip Rice Univ. of California Santa Cruz. Case Study: Overview of Issues. Prompted by performance problem in Identity Management batch process: Query is normally 1000+ statements per hour

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B+-Trees and Hashing Techniques for Storage and Index Structures

B+-Trees and Hashing Techniques for Storage and Index Structures. Rizwan Rehman Centre For Computer Studies Dibrugarh University. Alternative File Organizations. Many alternatives exist, each ideal for some situation , and not so good in others:

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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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Indexing

Indexing. February 28 th , 2003 Lecture 20. Review. What is index? Compare with primary key Why do we need index? Alternative for data entry k* in index? Data record with key value k < k , rid of data record with search key value k >

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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)

396 views • 31 slides

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)

426 views • 28 slides

ICS 421 Spring 2010 Indexing (1)

ICS 421 Spring 2010 Indexing (1). Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. How to speed u p queries?. SELECT * FROM Sailors WHERE age>40. Array of Sailor Tuples /Records. File of Record for Sailors. Binary Search Trees.

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B+-Trees

B+-Trees. Storage Technology: Topic 5. B+ Tree: Features. Insert/delete at log F N cost; keep tree height-balanced . (F = fanout, N = # leaf pages)

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Indexe s

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Word Part II

Word Part II. Table of Content & Index. Table of Contents. Creating a Table of Contents Click where you want to insert the table of contents On the Insert menu, point to Reference , and click Index and Tables . Click the Table of Contents tab.

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It444 Project

It444 Project. Project. Project. Indexer:

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