Midterm Exam Database Design Oracle

Section 1
(Answer all questions in this section)
1. The main subject areas taught by the Oracle Academy are: Mark for Review
(1) Points
Data Modeling, SQL, and PL/SQL (*)
Computer Repairs
Database performance tuning
Systems programming and computer architecture


2. What is the difference between "information" and "data"? Mark for Review
(1) Points
Data turns into useful information. It is stored in a database and accessed by systems and users. (*)


Information and data have no differences - they are two words for the same thing.
Information is held and understood only by users.
Data is held and understood only by users.


3. Consider your school library. It will have a database with transaction details of the books that are borrowed by students. Is the total number of books out on loan in one given month considered Data or Information? Mark for Review
(1) Points
Data
Information (*)
Both
Neither


4. 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.


Mark for Review
(1) Points
Yes (*)
No


5. The overall mission of the Oracle Corporation is to use the internet and fast processing servers to build its own network. Mark for Review
(1) Points
True
False (*)


6. In the grid computing model, resources are pooled together for efficiency. True or False? Mark for Review
(1) Points
True (*)
False


7. Personal computers (PCs) have been in existence since 1950. True or False? Mark for Review
(1) Points
True
False (*)


8. Entities are transformed into Tables during the Database Design process. True or False? Mark for Review
(1) Points
True (*)
False


9. Databases are used in most countries and by most governments. Life, as we know it, would change drastically if we no longer had access to databases. True or False? Mark for Review
(1) Points
True (*)
False


10. Oracle was one of the first relational database systems available commercially. True or False? Mark for Review
(1) Points
True (*)
False


Section 2
(Answer all questions in this section)


11. Data models show users the data that their Physical Model will contain. True or False? Mark for Review
(1) Points
True (*)
False


12. Data models are drawn to show users the actual Data that their new system will contain; only Data listed on the Diagram can be entered into the Database. True or False? Mark for Review
(1) Points
True (*)
False


13. An ERD is an example of a Physical Model. True or False? Mark for Review
(1) Points
True
False (*)


14. Documenting Business Requirements helps developers control the scope of the system and prevents users from claiming that the new system does not meet their business requirements. True or False? Mark for Review
(1) Points
True (*)
False


15. Which of the following attributes is suitable to be a Unique Identifier? Mark for Review
(1) Points
Address
Last name
First name
Social Security Number (*)


16. In the following statements, find two good examples of ENTITY: Instance. (Choose Two) Mark for Review
(1) Points
(Choose all correct answers)
BOOK: Biography of Mahatma Gandhi (*)
VEGETABLE: grows
TRAIN: runs
DAIRY PRODUCT: milk (*)


17. Which of the following is an example of a volatile attribute? Mark for Review
(1) Points
Hire Date
Name
Date of Birth
Age (*)


18. Which of the following entities most likely contains valid attributes? (Choose two) Mark for Review
(1) Points
(Choose all correct answers)
Entity: Home. Attributes: Number of Bedrooms, Owner, Address, Date Built (*)
Entity: Pet. Attributes: Name, Birthdate, Owner (*)
Entity: Car. Attributes: Owner Occupation, Owner Salary, Speed
Entity: Mother. Attributes: Name, Birthdate, Occupation, Start Date


19. All of the following could be attributes of an ENTITY called PERSON, except which one? Mark for Review
(1) Points
Gender
Natacha Hansen (*)
Weight
Haircolor


20. Which of the following are examples of ENTITY: Instance ? (Choose Two) Mark for Review
(1) Points
(Choose all correct answers)
MEAT PRODUCT: Lettuce
TRANSPORTATION METHOD: Car (*)
BODY PART: Larry Ellison
ANIMAL: Dog (*)


21. An Entity Relationship model is independent of the hardware or software used for implementation. True or False? Mark for Review
(1) Points
True (*)
False


22. Which of the following statements are true about ERD's? (Choose Two) Mark for Review
(1) Points
(Choose all correct answers)
You should not model derivable data. (*)
A piece of information can be shown multiple times on an ERD.
A piece of information should only be found in one place on an ERD. (*)
All data must be represented on the ERD, including derived summaries and the result of calculations.


23. Which of the following can be found in an ERD? (Choose Two) Mark for Review
(1) Points
(Choose all correct answers)
Attributes. (*)
Instances.
Entities. (*)
Tables.


Section 3
(Answer all questions in this section)


24. When reading a relationship between 2 entities, the relationship is read both from left to right and right to left. True or False? Mark for Review
(1) Points
True (*)
False


25. Relationship names are not shown on an ERD. True or False? Mark for Review
(1) Points
True
False (*)


26. Which symbol is used to show that a particular attribute is mandatory? Mark for Review
(1) Points
o
* (*)
#
&


27. Matrix Diagrams show Optionality and Cardinality of the ERDs they document. True or False? Mark for Review
(1) Points
True
False (*)


28. Matrix Diagrams are developed BEFORE the ERD. True or False? Mark for Review
(1) Points
True (*)
False


29. What are the three properties that every relationship should have? Mark for Review
(1) Points
Transferability, degree, name
Name, optionality, cardinality (*)
Name, optionality, arcs
A UID bar, a diamond, an arc


30. Which of the following are used to show Cardinality on an ERD? (Choose two) Mark for Review
(1) Points
(Choose all correct answers)
Dashed line.
Single toe. (*)
Crow's foot. (*)
Solid line.


Section 3
(Answer all questions in this section)


31. Relationship Cardinality is important. True or False? Mark for Review
(1) Points
True (*)
False


Section 4
(Answer all questions in this section)


32. Why is it important to identify and document business rules? Mark for Review
(1) Points
It allows you to create a complete data model and then check it for accuracy. (*)
It allows you to improve the client's business.
It ensures that the data model will automate all manual processes.
None of the above


33. Why is it important to identify and document structural rules? Mark for Review
(1) Points
Ensures we know what data to store and how that data works together. (*)
Ensures nothing. There are no benefits to be gained from documenting your Structural Business Rules. We need to concentrate on the Procedural Business Rules only.
Ensures we know what processes are in place and how to program them.
All of the Above.


34. How should you handle constraints that cannot be modeled on an ER diagram? Mark for Review
(1) Points
Explain them to the users so they can enforce them
Always let the network architect handle them
List them on a separate document to be handled programmatically (*)
All constraints must be modeled and shown on the ER diagram


35. A new system would have a mixture of both Procedural and Structural Business Rules as part of the documentation of that new system. True or False? Mark for Review
(1) Points
True (*)
False


36. All ER diagrams must have one of each of the following: (Choose two) Mark for Review
(1) Points
(Choose all correct answers)
At least one supertype and subtype
One or more Entities (*)
Relationships between entities (*)
Arcs


37. A subtype is drawn on an ERD as an entity inside the "softbox" of the supertype. True or False? Mark for Review
(1) Points
True (*)
False


38. A subtype is shown on an ERD as an entity with a one to many relationship to the supertype. True or False? Mark for Review
(1) Points
True
False (*)


39. A subtype can have a relationship not shared by the supertype. True or False? Mark for Review
(1) Points
True (*)
False


40. All instances of a subtype may be an instance of the supertype but does not have to. True or False? Mark for Review
(1) Points
True
False (*)


Section 5
(Answer all questions in this section)


41. If the same relationship is represented twice in an Entity Relationship Model, it is said to be: Mark for Review
(1) Points
Removable
Resourceful
Redundant (*)
Replicated


42. What uncommon relationship is described by the statements: "Each DNA SAMPLE may be taken from one and only one PERSON and each PERSON may provide one and only one DNA SAMPLE" Mark for Review
(1) Points
Many to Many Mandatory
One to Many Optional
One to Many Mandatory
One to One Optional (*)


43. If two entities have two relationships between them, these relationships can be either _____________ or _____________ . Mark for Review
(1) Points
Redundant or Required (*)
Replicated or Required
Resourced and Really Good
Redundant and Replicated


44. Which of the following pairs of entities is most likely to be modeled as a M:M relationship? Mark for Review
(1) Points
TREE and BRANCH
PERSON and FINGERPRINT
TEACHER and SUBJECT AREA (*)
CAR and WHEEL


45. When you resolve a M:M by creating an intersection entity, this new entity will always inherit: Mark for Review
(1) Points
The UID's from the entities in the original M:M.
The attributes of both related entities.
A relationship to each entity from the original M:M. (*)
Nothing is inherited from the original entities and relationship.


46. When you resolve a M:M, you simply re-draw the relationships between the two original entities; no new entities are created. True or False? Mark for Review
(1) Points
True
False (*)


47. If an intersection entity is formed that contains no attributes of its own, its uniqueness may be modeled by Mark for Review
(1) Points
Creating new attributes.
Barring the relationships to the original entities. (*)
Placing the UID attributes from the original entities into the intersection entity.
None of the above.


48. If a relationship can NOT be moved between instances of the entities it connects, it is said to be: Mark for Review
(1) Points
Mandatory
Transferable
Optional
Non-Transferable (*)


49. A non-transferable relationship means the relationship is manatory at both sides. True or False? Mark for Review
(1) Points
True
False (*)


50. A non-transferable relationship is represented by which of the following symbols? Mark for Review
(1) Points
Circle
Triangle
Heart

Diamond (*)