'Overflow pages' diaporamas de présentation

Charter Renewal Made Easy

425 views • 31 slides

CPSC 461 Final Review I

CPSC 461 Final Review I. Hessam Zakerzadeh Dina Said. 9.1) What is the most important difference between a disk and a tape?. 9.1) What is the most important difference between a disk and a tape?

516 views • 25 slides

Hash-based Indexes

Hash-based Indexes. CS 186, Spring 2006 Lecture 7 R &G Chapter 11. HASH, x. There is no definition for this word -- nobody knows what hash is. Ambrose Bierce, "The Devil's Dictionary", 1911. Introduction. As for any index, 3 alternatives for data entries k* :

356 views • 25 slides

Database Systems ( ????? )

Database Systems ( ????? ). November 8, 2004 Lecture #9 By Hao-hua Chu ( ??? ). Announcement. Midterm exam: November 20 (Sat): 2:30 PM in CSIE 101/103 Assignment #6 is available on the course homepage. It is due on 11/24 It is very difficult Suggest you do it before midterm exam

446 views • 24 slides

Hashing

Hashing. B+ Tree: The Most Widely Used Index. Insert/delete at log F N cost; keep tree height-balanced . (F = fanout, N = # leaf pages) Minimum 50% occupancy (except for root). Each node contains

309 views • 23 slides

Hashing

Hashing. Selection Queries. B+-tree is perfect, but.... to answer a selection query (ssn=10) needs to traverse a full path. In practice, 3-4 block accesses (depending on the height of the tree, buffering) Any better approach?.

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Instructor: Chen Li

CS 222P: Principles of Data Management Notes # 8 Static Hashing, Extendible Hashing ? Linear Hashing. Instructor: Chen Li. Introduction. Hash -based indexes are best for equality selections . Cannot support range searches.

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CAS CS 460/660 Introduction to Database Systems Indexing: Hashing

CAS CS 460/660 Introduction to Database Systems Indexing: Hashing. Introduction. Hash -based indexes are best for equality selections . Cannot support range searches. Static and dynamic hashing techniques exist; trade-offs similar to ISAM vs. B+ trees .

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Index tuning

Index tuning. Hash Index. Overview. Linear Hashing. This is another dynamic hashing scheme, an alternative to Extendible Hashing. LH handles the problem of long overflow chains without using a directory , and handles duplicates .

139 views • 13 slides