Querying Multi-granular Compact Representations

  • Romāns Kasperovičs
  • Michael Böhlen
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3882)


A common phenomenon of time-qualified data are temporal repetitions, i.e., the association of multiple time values with the same data. In order to deal with finite and infinite temporal repetitions in databases we must use compact representations. There have been many compact representations proposed, however, not all of them are equally efficient for query evaluation. In order to show it, we define a class of simple queries on compact representations. We compare a query evaluation time on our proposed multi-granular compact representation GSequences with a query evaluation time on single-granular compact representation PSets, based on periodical sets. We show experimentally how the performance of query evaluation can benefit from the compactness of a representation and from a special structure of GSequences.


Compact Representation Query Evaluation Time Granularity Simple Query Input Tuples 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Romāns Kasperovičs
    • 1
  • Michael Böhlen
    • 1
  1. 1.Free University of Bozen - BolzanoBozen, BolzanoItaly

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