Data Stores and Data Flows in System Design

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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?

An input data-flow Signup and view all the answers

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

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

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

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

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

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

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

An output data-flow Signup and view all the answers

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

True Signup and view all the answers

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

False Signup and view all the answers

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

True Signup and view all the answers

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

False Signup and view all the answers

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

False 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.

True Signup and view all the answers

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

False 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.

True Signup and view all the answers

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?

Which of the following statements about data stores is true?

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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