Test your basic knowledge |

Data Modeling

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. ____ yields better performance.






2. A ___ attribute is one that cannot be subdivided.






3. A table that has all key attributes defined - has no repeating groups - and all its attributes are dependent on the primary key - is said to be in ____.






4. Relationship strength depends on how the primary key of the related entity is formulated - while the relationship ____ depends on how the business rule is written.






5. If database tables are treated as though they were files in a file system - the ___ never has a chance to demonstrate its superior data-handling capabilities.






6. A ____ exists when there are functional dependencies such that Y is functionally dependent on X and Z is functionally dependent on Y - and X is the primary key.






7. Another word for existence-independent is ____.






8. The associative entity is also known as a ___ entity.






9. Dependencies can be identified with the help of a dependency _____.






10. Most designers consider the BCNF as a special case of the ____.






11. THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.






12. A table is in BCNF if every determinant in the table is a ____________.






13. An example of denormalization is using a ___ denormalized table to hold report data. This is required when creating a tabular report in which the columns represent data that is stored in the table as rows.






14. Need not be stored physically in the data base.






15. A talbe is in 4NF if it is 3NF and has no ________.






16. Dependencies based on only a part of a composite primary key are called ___ dependencies.






17. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.






18. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.






19. Refers to the level of detail represented by the values stored in a table's row






20. Data redundancy produces ____.






21. BCNF can be violated only if the table contains more than one ___ key.






22. A ___________ must not contain a repeating group .






23. ______________database tables often lead to various data redundancy disasters in production databases.






24. In a real-world environment - changing granularity requirements might dictate changes in primary key selection - and those changes might ultimately require the use of ____ keys.






25. View the data as part of a table or collection of tables in which all key values must be identified.






26. If you have three different transitive dependencies - ___ different determinants exist.






27. In order to meet ___ requirements - you may have to denormalize some portion of the database.






28. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.






29. An attribute that is part of a key is known as a ____ attribute.






30. 1NF - 2NF - and 3NF are _____.






31. Data redundancies occur from ____ of data on every row entry.






32. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.






33. A ___ derives its name from the fact that a group of multiple entries of the same type can exist for any single key attribute occurrence.






34. The price paid for increased performance through denormalization is a larger amount of ____.






35. The ___ refers to a specific table row as an entity instance.






36. The set of possible values for an attribute is a ____.






37. In the ERD - Cardinality is indicated using the ___ notation.






38. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.






39. Depicts all dependencies found within a given table structure is known as a ______.






40. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.






41. Complex ____ requirements may dictate data transformations - and they may expand the number of entities and attributes withing the design.






42. Improving ___ leads to more flexible queries.






43. An ERM is not dependent on the ____________.






44. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.






45. A ______ attribute can have only one value.






46. __________ is a process to help reduce the likelihood of data anomalies.






47. A table where all attributes are dependent on the primary key are independent of each other - and no row contains two or more multivalued facts about an entity - is said to be in ____.






48. Normalization represents a micro view of the ___ within the ERD.






49. Any attribute whose value determines other values within a row is called ____.






50. A _____ entity is composed of the primary keys of each of the entities to be connected.