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Evaluating Reachability Queries over Path Collections

Evaluating Reachability Queries over Path Collections. P. Bouros 1 , S. Skiadopoulos 2 , T. Dalamagas 3 , D. Sacharidis 3 , T. Sellis 1,3 1 National Technical University of Athens 2 University of Peleponnese 3 Institute for Management of Information Systems – R.C. Athena. Motivating example.

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Evaluating Reachability Queries over Path Collections

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  1. Evaluating Reachability Queries over Path Collections P. Bouros1, S. Skiadopoulos2, T. Dalamagas3, D. Sacharidis3, T. Sellis1,3 1National Technical University of Athens 2University of Peleponnese 3Institute for Management of Information Systems – R.C. Athena SSDBM'09

  2. Motivating example SSDBM'09

  3. Problem definition • Large path collections • Frequent updates • New paths • Evaluating reachability queries • Is there a path from node F to C? • Find a path from node F to C • Path collection SSDBM'09

  4. Solving the problem • Using a graph • Merge paths to build underlying graph • Apply graph search algorithm for queries • Our approach • Algorithm pfs • Visit nodes in paths in depth-first way • Push to dfs stack set of nodes at once • Index path collections, P-Index, pfsP • Index path connections, H-graph & H-Index, pfsH SSDBM'09

  5. Thank you! SSDBM'09

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