Computer implemented methods of retrieving hit count data from a data base system and according computer program product

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 (7R) accessing only each Nth machine word (10f), determining a fuzzy number of hit-relevant bit values of each accessed machine word (10f), calculating an estimated hit count by multiplying the fuzzy number by N, and outputting the estimated hit count from the data base system.