Storing and retrieving records in a computer system
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United States of America Patent
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Feb 14, 1995
Grant Date -
N/A
app pub date -
Mar 20, 1992
filing date -
Mar 20, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for determining whether a record, or an edited version thereof, is stored in a computer system. With this invention, whenever a record is stored in the system a hash function is applied to subsets of a key representing the record to be stored to generate multiple hash addresses. A copy of the key, or pointer thereto, is stored at each of the generated hash addresses. Whenever one wishes to determine whether a key is stored in the system, a hash function is applied to subsets of the test record to generate multiple hash addresses. The key for the test record then compared with the key stored in each of the generated hash addresses. If the key for the test record is sufficiently close to anyone of the keys found at the hash addresses, the test record is assumed to be stored in the system.
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