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B-Trees, Part 2 Hash-Based Indexes

B-Trees, Part 2 Hash-Based Indexes

B-Trees, Part 2 Hash-Based Indexes. R&G Chapter 10 Lecture 10. Administrivia. The new Homework 3 now available Due 1 week from Sunday Homework 4 available the week after Midterm exams available here. Review. Last time discussed File Organization Unordered heap files Sorted Files

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433 views • 38 slides
B-Trees, Part 2 Hash-Based Indexes

B-Trees, Part 2 Hash-Based Indexes

B-Trees, Part 2 Hash-Based Indexes. R&G Chapter 10 Lecture 10. Administrivia. The new Homework 3 now available Due 1 week from Sunday Homework 4 available the week after Midterm exams available here. Review. Last time discussed File Organization Unordered heap files Sorted Files

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459 views • 38 slides
Hashing

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

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309 views • 23 slides
Hash-Based Indexes

Hash-Based Indexes

Hash-Based Indexes. Comments. Comments on the exam? $1 for anyone who solved the puzzle. Rope Puzzle?. Who checked out Bill Gates speech?. Introduction. As for any index, 3 alternatives for data entries k* : Data record with key value k

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218 views • 21 slides
Hash-Based Indexes

Hash-Based Indexes

Hash-Based Indexes. Chapter 11. Introduction. As for any index, 3 alternatives for data entries k* : Data record with key value k < k , rid of data record with search key value k > < k , list of rids of data records with search key k > Choice orthogonal to the indexing technique

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289 views • 19 slides
Hash-Based Indexes

Hash-Based Indexes

Hash-Based Indexes. Chapter 11. Introduction. As for any index, 3 alternatives for data entries k* : Data record with key value k < k , rid of data record with search key value k > < k , list of rids of data records with search key k > Choice orthogonal to the indexing technique

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262 views • 19 slides
Hash-Based Indexes

Hash-Based Indexes

Hash-Based Indexes. Chapter 11. Introduction. As for any index, 3 alternatives for data entries k* : Data record with key value k < k , rid of data record with search key value k > < k , list of rids of data records with search key k > Choice orthogonal to the indexing technique

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199 views • 19 slides
CAS CS 460/660 Introduction to Database Systems Indexing: Hashing

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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154 views • 15 slides

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