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• W1483146256 abstract "Temporal aggregation is an important but costly operation for applications that maintain time-evolving data (data warehouses, temporal databases, etc.). In this paper we examine the problem of computing temporal aggregates over data streams. Such aggregates are maintained using multiple levels of temporal granularities: older data is aggregated using coarser granularities while more recent data is aggregated with finer detail. We present specialized indexing schemes for dynamically and progressively maintaining temporal aggregates. Moreover, these schemes can be parameterized. The levels of granularity as well as their corresponding index sizes (or validity lengths) can be dynamically adjusted. This provides a useful trade-o. between aggregation detail and storage space. Analytical and experimental results show the efficiency of the proposed structures. Moreover, we discuss how the indexing schemes can be extended to solve the more general range temporal and spatiotemporal aggregation problems." @default.
• W1483146256 created "2016-06-24" @default.
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• W1483146256 date "2002-01-01" @default.
• W1483146256 modified "2023-09-27" @default.
• W1483146256 title "Temporal Aggregation over Data Streams Using Multiple Granularities" @default.
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• W1483146256 doi "https://doi.org/10.1007/3-540-45876-x_40" @default.
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