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| Title: | Continuous nearest neighbor queries over sliding windows |
| Authors: | Mouratidis, Kyriakos
Papadias, Dimitris |
| Keywords: | Location-dependent and sensitive
Spatial databases
Query processing
Nearest neighbors
Data streams
Sliding windows |
| Issue Date: | Jun-2007 |
| Citation: | IEEE transactions on knowledge and data engineering, v. 19, no. 6, June 2007, p. 789-803 |
| Abstract: | This paper studies continuous monitoring of nearest neighbor (NN) queries over sliding window streams. According to this model, data points continuously stream in the system and they are considered valid only while they belong to a sliding window that contains (i) the W most recent arrivals (count-based), or (ii) the arrivals within a fixed interval W covering the most recent timestamps (time-based). The task of the query processor is to constantly maintain the result of long running NN queries among the valid data. We present two processing techniques that apply to both count-based and time-based Windows. The first one adapts conceptual partitioning, the best existing method for continuous NN monitoring over update streams, to the sliding window model. The second technique reduces the problem to skyline maintenance in the distance-time space and pre-computes the future changes in the NN set. We analyze the performance of both algorithms, and extend them to variations of NN search. Finally, we compare their efficiency through a comprehensive experimental evaluation. The skyline-based algorithm achieves lower CPU cost, at the expense of slightly larger space overhead. |
| Rights: | © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| URI: | http://hdl.handle.net/1783.1/2981 |
| Appears in Collections: | CSE Journal/Magazine Articles
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