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Ranking Cubes – Efficient Computation of Ranking queries

  • Data cube helps not only OLAP but also ranked search
  • (top-k) ranking query: only returns the best k results according to a user-specified preference, consisting of (1) a selection condition and (2) a ranking function
  • Ex.: Search for apartments with expected price 1000 and expected square feet 800
      • Select top 1 from Apartment
      • where City = “LA” and Num_Bedroom = 2
      • order by [price – 1000]^2 + [sq feet - 800]^2 asc
  • Efficiency question: Can we only search what we need?
    • Build a ranking cube on both selection dimensions and ranking dimensions

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