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Query Stability in Monotonic Data-Aware Business Processes

Authors Ognjen Savkovic, Elisa Marengo, Werner Nutt

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Ognjen Savkovic
Elisa Marengo
Werner Nutt

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Ognjen Savkovic, Elisa Marengo, and Werner Nutt. Query Stability in Monotonic Data-Aware Business Processes. In 19th International Conference on Database Theory (ICDT 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 48, pp. 16:1-16:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016) https://doi.org/10.4230/LIPIcs.ICDT.2016.16

Abstract

Organizations continuously accumulate data, often according to some business processes. If one poses a query over such data for decision support, it is important to know whether the query is stable, that is, whether the answers will stay the same or may change in the future because business processes may add further data. We investigate query stability for conjunctive queries. To this end, we define a formalism that combines an explicit representation of the control flow of a process with a specification of how data is read and inserted into the database. We consider different restrictions of the process model and the state of the system, such as negation in conditions, cyclic executions, read access to written data, presence of pending process instances, and the possibility to start fresh process instances. We identify for which restriction combinations stability of conjunctive queries is decidable and provide encodings into variants of Datalog that are optimal with respect to the worst-case complexity of the problem.

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Keywords
  • Business Processes
  • Query Stability

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