DOCUMENT SEARCHING DEVICE AND DOCUMENT SEARCHING METHOD
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United States of America Patent
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Issued Date -
Mar 25, 2010
app pub date -
Sep 26, 2007
filing date -
Sep 26, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In registering a new document file in an index, the accumulated percentage of the number of registered keys A from registered keys associated with one posting data, including registered data, is computed. The posting data of a registered key associated with the number of posting data items, which is at most a threshold N, is stored in a leaf page of a balanced-plus tree constituted of the registered keys, and the posting data of a registered key associated with the number of posting data items, which is greater than the threshold N, is stored in a page of a posting-storing unit. When the accumulated number i of registered documents is a predetermined document number, the threshold N of the number of posting data items is changed to the maximum number of the posting data items that are associated with a registered key where the accumulated percentage is less than 60 percent.
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