Publication
SIGMOD 1979
Conference paper

Compact B-trees

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Abstract

A B-tree is compact if it is minimal in number of nodes, hence has optimal space utilization, among equally capacious B-trees of the same order. The space utilization of compact B-trees is analyzed and is compared with that of noncompact B-trees and of (node)-visit-optimal B-trees, which minimize the expected number of nodes visited per key access. Compact B-trees can be as much as a factor of 2.5 more space-efficient than visit-optimal B-trees; and the node-visit cost of a compact tree is never more than 1 + the node-visit cost of an optimal tree. Finally, an in-place compactification algorithm is presented which operates in linear time in the size of the file.

Date

30 May 1979

Publication

SIGMOD 1979

Authors

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