'Correct leaf' diaporamas de présentation

CSE 332 Data Abstractions : B Trees and Hash Tables Make a Complete Breakfast

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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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B+ Trees

B+ Trees. Tree-Structured Indices. Tree-structured indexing techniques support both range searches and equality searches . ISAM : static structure; B+ tree : dynamic, adjusts gracefully under inserts and deletes. Overflow . page. index entry. ISAM. P. K. P. P. K. P. K. m. 2.

297 views • 18 slides

Tree-Structured Indexes

Tree-Structured Indexes. Module 4, Lecture 4. Introduction. As for any index, 3 alternatives for data entries k* : 1. Data record with key value k 2. < k , rid of data record with search key value k > 3. < k , list of rids of data records with search key k >

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BCNF vs 3NF

BCNF vs 3NF. BCNF : For every functional dependency X->Y in a set F of functional dependencies over relation R , either: Y is a subset of X or, X is a superkey of R 3NF : For every functional dependency X->Y in a set F of functional dependencies over relation R , either:

1.56k views • 8 slides