A DAG Comparison Algorithm and Its Application to Temporal Data Warehousing

  • Johann Eder
  • Karl Wiggisser
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4231)

Abstract

We present a new technique for discovering and representing structural changes between two versions of a directed acyclic graph (DAG). Motivated by the necessity of change detection in temporal data warehouses and inspired by a well known tree comparison algorithm, we developed a heuristic method to calculate an edit script transforming an old version of a graph to the new one. This edit script is composed of operations for inserting and deleting nodes and changing labels and values of nodes as well as for inserting and deleting edges to cover rearrangements of nodes (moves). We present the prerequisites of our approach, the different phases of the algorithm and discuss some evaluation results gained from a prototypic implementation. Our approach is applicable to arbitrary labeled DAGs in any context, but optimized for rooted, ordered and labeled acyclic digraphs with a small rate of changes between the DAGs to be compared.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Johann Eder
    • 1
  • Karl Wiggisser
    • 2
  1. 1.Dep. of Knowledge and Business EngineeringUniversity of Vienna 
  2. 2.Dep. of Informatics-SystemsAlps Adria University Klagenfurt 

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