Oracle Academy, Quiz Answer Section 1 2 3, data base modeling

1. What are the major content areas covered in the Oracle Academy? Data Modeling, SQL, and PL/SQL (*)

2.

The demand for Information Technology professionals in today's market is increasing. True or False? True (*)

3.

How do you turn "data" into "information"? By querying it or accessing it (*)

4.

What are the results of having all your data in one central location? (Choose two) Improved performance (*)

Easier access to data (*) 5.

Consider an example where an Oracle database works "behind the scenes" for common internet activity. Which of the following best describes a database transaction? A person searches an airline website to find all available fares for a flight. (*)

6.

Which of the following are examples of data vs. information: E. A, B, and D (*)

7.

Which of the following represents the correct sequence of steps in the Database Development Process? Analyze, Design, Build (*)

8.

Data Modeling is the last step in the database development process. True or False? False (*)

9.

Oracle was one of the first relational database systems available commercially. True or False? True (*)

10. The overall mission of the Oracle Corporation is to use the internet and fast processing servers to build its own network. GUI software (*) Internet Browser software (*) Operating System software (*)

11. Changes in computing have affected many of our day-to-day activities. Are all of the following

activities examples of this change? Yes or No? In the past you used to use the phone system to call directory assistance to get a phone number. Today you can use your PC to look up a phone number online. In the past you used to have to go to the shoe store to buy shoes. Today you can use your PC to order shoes online. In the past you had to use your PC to send a person an email. Today you can use your phone to send a text message Yes (*) 12. Personal computers (PCs) have been in existence since 1950. True or False? False (*) 13. In the grid computing model, resources are pooled together for efficiency. True or False? True (*) 14. Which of the following are examples of e-businesses that use database software? Online personal shopping service (*) Online clothing store (*) Online book store (*) 15. Which of the following are reasons we create conceptual models? All of the above (*)

16. An Entity Relationship Diagram is an example of a Physical Model. True or False? False (*) 17. A customized hat sitting on your friend's head is an example of which model--the conceptual model or the physical model? Physical Model (*) 18. Many reasons exist for creating a conceptual model. Choose three appropriate reasons from the options below. They accurately describe what a physical model will contain. (*) They capture current and future needs. (*) They model functional and informational needs. (*) A/an _________ is a piece of information that in some way describes an entity. It is a property of the entity and it quantifies, qualifies, classifies, or specifies the entity Attribute (*) In a physical data model, an attribute is represented as a/an Column (*) Entities are usually verbs. True or False? False (*) Which of the following entities most likely contains invalid attributes? Entity: Car. Attributes: Owner Occupation, Owner Salary, Speed (*) An entity may have which of the following? Instances (*) Which of the following statements about attributes are true? (Choose Two) They describe, qualify, quantify, classify, or specify an entity. (*) They have a data type, such as number or character string. (*) In the following statements, find two good examples of ENTITY: Instance. (Choose Two) DAIRY PRODUCT: milk (*) BOOK: Biography of Mahatma Gandhi (*) Unique Identifiers: Distinguish one instance of an entity from all other instances of that entity (*) The word "Volatile" means: Changing constantly; unstable (*) Some of the following could be attributes of an ENTITY called PERSON; select the INCORRECT attributes for PERSON. (Choose Two) Freddy Wilson (*) Priya Hansenna (*) All of the following would be instances of the entity PERSON except which? Male (*) What is the purpose of a Unique Identifier? To identify one unique instance of an entity by using one or more attributes and/or relationships. (*) An Entity Relationship model is independent of the hardware or software used for implementation. True or False? True (*) The purpose of an ERD is to document the proposed system and facilitate discussion and understanding of the requirements captured by the developer. True or False? True (*) A well structured ERD will show only some parts of the finished data model. You should never try to model the entire system in one diagram, no matter how small the diagram might be. True or False? False (*) Which of the following statements are true about ERD's? (Choose Two)

A piece of information should only be found in one place on an ERD. (*) You should not model derivable data. (*) What are the three properties that every relationship should have? Name, optionality, cardinality (*) Relationships can be either mandatory or optional. True or False? True (*) Relationships always exist between 2 entities (or one entity and itself) (*) In a business that sells computers, choose the best relationship name from CUSTOMER to ITEM (computer, in this case). Each CUSTOMER must be the buyer of one or more ITEMS. (*) Consider the recommended drawing conventions for ERD's. Indicate which of the following accurately describes diagramming conventions for entities and attributes: The * means that an attribute is mandatory or required; the entity name should be singular. (*) Entity names are always plural. True or False? False (*) Which symbol is used to show that a particular attribute is optional? o (*) On an ER diagram, which symbol identifies an attribute as part of a unique identifier. # (*) Entity boxes are drawn as Soft Boxes (*) Attributes are written inside the entity to which they belong. True or False? True (*) Two entities can have one or more relationships between them. True or False? True (*) After looking at the diagram, choose the sentence below that could be "read" from the existing relationship (even though you're missing relationship labels!) Each Student may participate in one or more Activities. (*) When reading a relationship between 2 entities, the relationship is only read from left to right. True or False? False (*) A Matrix Diagram will help you with all of the following except: Naming Relationships Creating a Matrix Diagram is a mandatory step in Data Modeling. True or False? False (*) Matrix Diagrams help verify that you have identified all possible relationships between your existing entities. True or False? True (*)