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Efficient computation of trade-off skylines

Efficient computation of trade-off skylines,10.1145/1739041.1739112,Christoph Lofi,Ulrich Güntzer,Wolf-Tilo Balke

Efficient computation of trade-off skylines   (Citations: 2)
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When selecting alternatives from large amounts of data, trade-offs play a vital role in everyday decision making. In databases this is primarily reflected by the top-k retrieval paradigm. But recently it has been convincingly argued that it is almost impossible for users to provide meaningful scoring functions for top-k retrieval, subsequently leading to the adoption of the skyline paradigm. Here users just specify the relevant attributes in a query and all suboptimal alternatives are filtered following the Pareto semantics. Up to now the intuitive concept of compensation, however, cannot be used in skyline queries, which also contributes to the often unmanageably large result set sizes. In this paper we discuss an innovative and efficient method for computing skylines allowing the use of qualitative trade-offs. Such trade-offs compare examples from the database on a focused subset of attributes. Thus, users can provide information on how much they are willing to sacrifice to gain an improvement in some other attribute(s). Our contribution is the design of the first skyline algorithm allowing for qualitative compensation across attributes. Moreover, we also provide an novel trade-off representation structure to speed up retrieval. Indeed our experiments show efficient performance allowing for focused skyline sets in practical applications. Moreover, we show that the necessary amount of object comparisons can be sped up by an order of magnitude using our indexing techniques.
Conference: Extending Database Technology - EDBT , pp. 597-608, 2010
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    • ... object order [22], trade-off sklyines with severly reduced expressivness but not requiring the object order at all [18], to computing trade-off skylines allowing the specification of any consistent trade-off without restrictions while still providing acceptable performance by relying on a compressed datastructure minimally representing those parts of the object order which are cruicial for computing the respective trade-off skyline [24]...

    Christoph Lofi. Choosing the right thing: Cooperative trade-off enhanced skyline queri...

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