The COMET Metamodel for Temporal Data Warehouses

  • Johann Eder
  • Christian Koncilia
  • Tadeusz Morzy
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2348)


“The Times They Are A-Changing” (B. Dylan), and with them the structures, schemas, master data, etc. of data warehouses. For the correct treatment of such changes in OLAP queries the orthogonality assumption of star schemas has to be abandoned. We propose the COMET model which allows to represent not only changes of transaction data, as usual in data warehouses, but also of schema, and structure data. The COMET model can then be used as basis of OLAP tools which are aware of structural changes and permit correct query results spanning multiple periods and thus different versions of dimension data. In this paper we present the COMET metamodel in detail with all necessary integrity constraints and show how the intervals of structural stabilities can be computed for all components of a data warehouse.


Dimension Data Transformation Function Integrity Constraint Structure Version Hierarchical Relation 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Johann Eder
    • 1
  • Christian Koncilia
    • 1
  • Tadeusz Morzy
    • 2
  1. 1.Dep. of Informatics-SystemsUniversity of KlagenfurtAustria
  2. 2.Institute of Computing SciencePoznan University of TechnologyPoland

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