Methods and apparatus for information storage and retrieval usin

Details Methods and apparatus for information storage and retrieval usin Methods and apparatus for information storage and retrieval usin

1997-01-02

1999-04-06

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 1, 707100, 707101, 707202, G06F 1730

Patent

active

058931201

ABSTRACT:
A method and apparatus for performing storage and retrieval in an information storage system is disclosed that uses the hashing technique with the external chaining method for collision resolution. In order to prevent performance deterioration due to the presence of automatically expiring data items, a garbage collection technique is used that removes all expired records stored in the system in the external chain targeted by a probe into the data storage system. More particularly, each insertion, retrieval, or deletion of a record is an occasion to search an entire linked-list chain of records for expired items and then remove them. Because an expired data item will not remain in the system long term if the system is frequently probed, it is useful for large information storage systems that are heavily used, require the fast access provided by hashing, and cannot be taken off-line for removal of expired data.

REFERENCES:
patent: 5121495 (1992-06-01), Nemes
patent: 5202981 (1993-04-01), Shackelford
patent: 5287499 (1994-02-01), Nemes
D.E. Knuth, The Art of Computer Programming, vol. 3, Sorting and Searching, Addison-Wesley, Reading, Massachusetts, 1973, pp. 506-549.
R.L. Kruse, Data Structures and Program Design, Second Edition, Prentice-Hall, Englewood Cliffs, New Jersey, 1987, Section 6.5, "Hashing," and Section 6.6, Analysis of Hashing, pp. 198-215.
D. F. Stubbs and N.W. Webre, Data Structure with Abstract Data Types and Pascal, Brooks/Cole Publishing Company, Monterey, California, 1985, Section 7.4, "Hased Implementations," pp. 310-336.

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