| 摘要 |
A computer implemented method of retrieving hit count data from data base system comprises the steps of scanning through the bitmap data structure ( 7 R) accessing only each Nth machine word ( 10 f), determining a fuzzy number of hit-relevant bit values of each accessed machine word ( 1 f), calculating an estimated hit count by multiplying the fuzzy number by N, and outputting the estimated hit count from the data base system.
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