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Extensible hash table - PowerPoint PPT Presentation

B-Trees

B-Trees. Size and Lookup. Records sorted on search key, with 10 records per blocks. The B-tree is a dense index. 1,000,000 /10 = 100,000 blocks to hold the records For the B-tree we reason as follows: We need 1,000,000 pointers at the leaves to point to each record.

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Lecture 21: Hash Tables

Lecture 21: Hash Tables. Monday, February 28, 2005. Outline. Hash-tables (13.4) Note: Used as indexes (far less than B+ trees) Used during query processing (a lot !!). Hash Tables. Secondary storage hash tables are much like main memory ones Recall basics: There are n buckets

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Extensible hash table - PowerPoint PPT Presentation

B-Trees

Lecture 21: Hash Tables