Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

OR-Join

  • Nathaniel Palmer
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1551

Synonyms

Synchronous join

Definition

The point of convergence within a workflow following alternative, mutually exclusive paths.

Key Points

An OR-Join (Fig.  1) represents a point within a workflow where two or more alternative workflow branches re-converge following an OR-Split into a single common activity as the next step within the workflow. In contrast with an AND-Join, no parallel activity execution has occurred at the join point, therefore no synchronization is required. With an OR-Join a thread of control may arrive at the specific activity via any of several alternative preceding activities.
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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Workflow Management CoalitionHinghamUSA

Section editors and affiliations

  • Barbara Pernici
    • 1
  1. 1.Dept. di Elettronica e InformazionePolitecnico di MilanoMilanItaly