Optimal Distribution of Signatures in Signature Hashing

Authors:
M. V. Ramakrishna;E. A. Ramos
Affiliations:
-;-
Venue:
IEEE Transactions on Knowledge and Data Engineering
Year:
1992

Citing 5
Cited 0

File organization and processing

File organization and processing
External hashing with limited internal storage

Journal of the ACM (JACM)
Analysis of Uniform Hashing

Journal of the ACM (JACM)
File organization: implementation of a method guaranteeing retrieval in one access

Communications of the ACM
External hasing with limited internal storage

PODS '82 Proceedings of the 1st ACM SIGACT-SIGMOD symposium on Principles of database systems

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Abstract

G.H. Gonnet and P.A. Larson (1982) proposed a hashing scheme for external files which guarantees single access retrieval. They provided an asymptotic analysis of the scheme assuming uniform distribution of the signatures. This paper addresses an open problem posed by them in a second work (J. ACM, vol.35, no.1, p.161-84, 1988) about the performance of signatures having a skew distribution. An optimization problem is formulated to obtain the optimal signature distribution which maximizes the resulting load factor. Numerical results indicate that the optimal signature distribution results in significant reduction in the cost of insertions, which is of practical significance.