Data Stores and Data Flows in System Design
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Questions and Answers

What is the primary purpose of a data store in a data-flow diagram?

  • To process data before sending it to other components
  • To represent a situation where the system must retain data for later use by one or more processes (correct)
  • To store data permanently and prevent any modifications
  • To act as a backup system for data redundancy

    • Which of the following statements about data stores is true?

  • A data store must have at least one input data-flow and one output data-flow (correct)
  • A data store can exist without any data-flows connected to it
  • A data store can be connected to an entity without any process
  • A data store can have only input data-flows or only output data-flows

    • Which of the following statements about data-flows is true?

  • A data-flow can move directly from an entity to a data store without any processing
  • A data-flow can represent a single data element or a set of data elements (correct)
  • A data-flow can move directly from a data store to an external entity without being processed
  • A data-flow can move directly from one data store to another without being processed

    • What does the notation of a straight line with an incoming arrow represent in a data-flow diagram?

    <p>An input data-flow</p> Signup and view all the answers

    Which of the following statements about data-flow rules is true?

    <p>Data cannot move directly from one data store to another without being processed</p> Signup and view all the answers

    According to the data-flow rules, which of the following is incorrect?

    <p>Data can move directly from one data store to another without being processed</p> Signup and view all the answers

    Which of the following statements is true about processes in a data-flow diagram?

    <p>At least one data-flow must enter and one data-flow must exit each process symbol</p> Signup and view all the answers

    What does the notation of a straight line with an outgoing arrow represent in a data-flow diagram?

    <p>An output data-flow</p> Signup and view all the answers

    A data store must have at least one input data-flow and at least one output data-flow.

    <p>True</p> Signup and view all the answers

    Data can move directly from an entity to a data store without being processed.

    <p>False</p> Signup and view all the answers

    A data-flow can represent a single data element or a set of data elements (a data structure).

    <p>True</p> Signup and view all the answers

    Data can move directly from one data store to another without being processed.

    <p>False</p> Signup and view all the answers

    A data-flow with an incoming arrow represents an output data-flow.

    <p>False</p> Signup and view all the answers

    A data store is used in a data-flow diagram to represent a situation when the system must retain data because one or more processes need to use the stored data in a later time.

    <p>True</p> Signup and view all the answers

    Data can move directly from a data store to an external entity without being processed.

    <p>False</p> Signup and view all the answers

    Every process in a data-flow diagram must have at least one input data-flow and one output data-flow.

    <p>True</p> Signup and view all the answers

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