Best Position Algorithms for Top-k Queries 1

The general problem of answering top-k queries can be modeled using lists of data items sorted by their local sco res. The most efficient algorithm proposed so far for answering t op-k queries over sorted lists is the Threshold Algorithm (TA). However, TA may still incur a lot of useless accesses to the li sts. In this paper, we propose two new algorithms which stop much soone r. First, we propose the best position algorithm (BPA) which executes topk queries more efficiently than TA. For any databas e instance ( i.e. set of sorted lists), we prove that BPA stops as ea rly as TA, and that its execution cost is never higher than TA. We show that the position at which BPA stops can be (m-1) times lower than that of TA, where m is the number of lists. We also show that the execution cost of our algorithm can be (m-1) times lower than that of TA. Second, we propose the BPA2 algorithm which is much more efficient than BPA. We show that the number of accesses to the lists done by BPA2 can be about (m-1) times lower than that of BPA. Our performance evaluation shows that over ou test databases, BPA and BPA2 achieve significant perform ance gains in comparison with TA.