IDA Dept. of Computer and Information science, Linköping University

IDA Technical Reports: abstract

Generated: Sat, 25 Oct 2014 08:21:38

Lin, L., Risch, T., and Badal, D. (1996). Indexing Values of Time Sequences. Technical Report LiTH-IDA-R-96-29, Department of Computer and Information Science, Linköping University, Sweden. (bibtex),

Abstract: A time sequence is a discrete sequence of values, e.g. temperature measurements, varying over time. Conventional indexes for time sequences are built on the time domain and cannot deal with inverse queries on a time sequence (i.e. computing the times when the values satisfy some conditions). To process an inverse query the entire time sequence has to be scanned. This paper presents a dynamic indexing technique on the value domain for large time sequences which can be implemented using regular ordered indexing techniques (e.g. B-trees). Our index (termed IP-index) dramatically improves the query processing time of inverse queries compared to linear scanning. For periodic time sequences that have a limited range and precision on their value domain (most time sequences have this property), the IP-index has an upper bound for insertion time and search time.


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