| 摘要 |
A method for constructing an index suitable for indexing a large set of records identified by long generally randomly distributed record names, and for answering membership queries about the set, the method comprising adding a new record to the set and assigning the new record a new record name using a process designed to produce names where at least a portion of each name is at least approximately random, determining that the new record name is not already represented in the index by checking a first level index, combining the new record name with record name information already represented in the index to form a combined record name which is shorter than the new record name, and adding the combined record name to the first level index to form a new first level index entry that represents the new record, wherein the first level index does not contain information sufficient to conclude that the new record name has been added to the index, wherein each different record in the set is assigned a different record name, wherein at least a portion of the first level index is ordered based on record names.
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