An Entity-Relationship (E-R)diagram

question 19

Multiple Choice

An entity-relationship (E-R) diagram

• A) can represent the contents of any database.
• B) are only used in conjunction with REA models.
• C) can show a limited number of entities and relationships.
• D) are used only to design new databases.

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Definitions:

MTBF

Mean Time Between Failures, a reliability metric for products and systems that estimates the average time between operational failures.

System Reliability

The probability of a system or component performing its required functions under stated conditions for a specified period of time.

Parallel Components

Components that are designed to work alongside each other within a system, often to increase redundancy and reliability.

Cost Curves

Graphical representations that show how the cost of producing a good or service changes with changes in the production volume.