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OR-Join

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Encyclopedia of Database Systems
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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.

OR-Join, Fig. 1
figure 1526 figure 1526

OR-Join

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Correspondence to Nathaniel Palmer .

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Palmer, N. (2018). OR-Join. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_1551

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