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Identification of concurrency
Identification of concurrency: Dynamic model identifies concurrency. Two objects are said to be parallel (concurrent) if they can receive events at the same time. Concurrent objects are required to be assigned to several threads of control.
Figure: Concurrency without synchronization
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What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
how draw er diagram
East Coast Aquarium Relational Database
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