Modeling and querying facts with period timestamps in data warehouses

• Autorzy: Mahlknecht Giovanni , Dignös Anton , Kozmina Natalija

Identyfikatory

DOI

10.2478/amcs-2019-0003

• Języki publikacji: EN

Abstrakty

EN

In this paper, we study various ways of representing and querying fact data that are time-stamped with a time period in a data warehouse. The main focus is on how to represent the time periods that are associated with the facts in order to support convenient and efficient aggregations over time. We propose three distinct logical models that represent time periods as sets of all time points in a period (instant model), as pairs of start and end time points of a period (period model), and as atomic units that are explicitly stored in a new period dimension (period^∗ model). The period dimension is enriched with information about the days of each period, thereby combining the former two models. We use four different classes of aggregation queries to analyze query formulation, query execution, and query performance over the three models. An extensive empirical evaluation on synthetic and real-world datasets and the analysis of the query execution plans reveal that the period model is the best choice in terms of runtime and space for all four query classes.

Słowa kluczowe

EN

data warehouse; time period; logical model

PL

hurtownia danych; odcinek czasu; model logiczny

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mathematics and Computer Science
• Rocznik: 2019
• Tom: Vol. 29, no. 1
• Strony: 31--49
• Opis fizyczny: Bibliogr. 43 poz., rys., tab., wykr.

Twórcy

autor

Mahlknecht Giovanni

• Faculty of Computer Science, Free University of Bozen-Bolzano, Dominikanerplatz 3, 39100 Bozen, Italy

autor

Dignös Anton

• Faculty of Computer Science, Free University of Bozen-Bolzano, Dominikanerplatz 3, 39100 Bozen, Italy

autor

Kozmina Natalija

• Faculty of Computing, University of Latvia, Raiņa bulvāris 19, Riga, LV-1586, Latvia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).