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. In order to meet performance requirements - you may have to denormalize portions of the ________.






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






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






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






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






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






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






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






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






10. ________ cannot be further subdivided.






11. Another word for existence-independent is ____.






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






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






14. ____ yields better performance.






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






16. 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.






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






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






19. A ___ identifier is composed of more than one attribute.






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






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






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






23. 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.






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






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






26. 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.






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






28. A ___ relationship exists when an association is maintained within a single entity.






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






30. According to naming conventions described in Chapter 2 - ___ would be the best name for a column representing the charges per hour in a table named JOB.






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






32. A table that is in 2NF and contains no transitive dependencies is said to be in ___.






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






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






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






36. 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 ____.






37. A ___________ must not contain a repeating group .






38. 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 ____.






39. For most business transactional databases - we should normalize relations into ____.






40. 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.






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






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






43. An ERM is not dependent on the ____________.






44. If a table has multiple candidate keys and one of those candidate keys is a composite key - the table can have ___ based on this composite candidate key - even when the primary key chosen is a single attribute.






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






46. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.






47. From a structural point of view - ______ is better than 1NF






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






49. Data redundancy produces ____.






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