'De allocated overflow pages' presentation slideshows

Advanced Data Structures NTUA Spring 2007 B+-trees and External memory Hashing

Advanced Data Structures NTUA Spring 2007 B+-trees and External memory Hashing. Model of Computation. Data stored on disk(s) Minimum transfer unit: a page(or block) = b bytes or B records N records -> N/B = n pages I/O complexity: in number of pages. CPU. Memory. Disk.

602 views • 47 slides

Hash-Based Indexes

301 views • 28 slides

CS 405G: Introduction to Database Systems

CS 405G: Introduction to Database Systems. 23 Hashing Chen Qian University of Kentucky. B+-tree Organization. Internal node. Leaf node. Review. B + -tree Insert Find correct leaf L. Put data entry onto L . If L has enough space, done !

403 views • 26 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* :

360 views • 25 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?.

226 views • 22 slides