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Space/time trade-offs in hash coding with allowable errors

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Burton H. BloomAuthors Info & Claims

Communications of the ACM, Volume 13, Issue 7

Pages 422 - 426

https://doi.org/10.1145/362686.362692

Published: 01 July 1970 Publication History

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Abstract

In this paper trade-offs among certain computational factors in hash coding are analyzed. The paradigm problem considered is that of testing a series of messages one-by-one for membership in a given set of messages. Two new hash-coding methods are examined and compared with a particular conventional hash-coding method. The computational factors considered are the size of the hash area (space), the time required to identify a message as a nonmember of the given set (reject time), and an allowable error frequency.

The new methods are intended to reduce the amount of space required to contain the hash-coded information from that associated with conventional methods. The reduction in space is accomplished by exploiting the possibility that a small fraction of errors of commission may be tolerable in some applications, in particular, applications in which a large amount of data is involved and a core resident hash area is consequently not feasible using conventional methods.

In such applications, it is envisaged that overall performance could be improved by using a smaller core resident hash area in conjunction with the new methods and, when necessary, by using some secondary and perhaps time-consuming test to “catch” the small fraction of errors associated with the new methods. An example is discussed which illustrates possible areas of application for the new methods.

Analysis of the paradigm problem demonstrates that allowing a small number of test messages to be falsely identified as members of the given set will permit a much smaller hash area to be used without increasing reject time.

References

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BATSON, A. The organization of symbol tables. Comm. ACM 8, 2 (Feb. 1965), 111-112.

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[2]

MAURER, W. D. An improved hash code for scatter storage. Comm. ACM 11, 1 (Jan. 1968), 35-38.

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MORRIS, R. Scatter storage techniques. Comm. ACM 11, 1 (Jan. 1968), 38-44.

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Published In

Communications of the ACM Volume 13, Issue 7

July 1970

70 pages

ISSN:0001-0782

EISSN:1557-7317

DOI:10.1145/362686

Editor:
M. Stuart Lynn
IBM Scientific Center, Houston, TX

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Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 01 July 1970

Published in CACM Volume 13, Issue 7

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