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What is a Data Flow Diagram?
Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes which transform them to their destinations in other objects.
It does not show how values are controlled while computation. The Data Flow Diagram shows functional relationship of values computed by a system. DFD contains processes which transform data, data flows which move data, actor objects which produce and consume data and data store objects which store data passively.
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
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Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
what is the relationship between receipt and owner entities in computer sales and service company
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Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
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