Test your basic knowledge |

Data Mining

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. Which statement will take away user privileges to the database?






2. Are a data mining technology.






3. A _____________ is a system-generated primary key.






4. The SQL command for deleting the Warehouse field from the Part table is _____.






5. On an ER Diagram the number (mark) on relationship line that is farthest away from each entity (rectangle) represents the _______ cardinality.






6. An economic feasibility measure. So is Internal rate of return.






7. The ACCESS feature that tests to see if your tables are normalized properly is the ____.






8. A compound semantic object is an object that contains at least one ____.






9. _________ seeks to ensure that each application under development is fully integrated within its own boundaries and to eliminate any inconsistencies in the final software product.






10. The term "ETL" in data warehousing stands for: Extraction - ________________________ - & Loading.






11. Which data mining technique utilizes linkage analysis to search operational transactions for patterns with a high probability of repetition?






12. Useful for assessing performance in terms of identifying the most important class. Helps such choices as: How many tax records to examine; How many loans to grant; How many customers to mail an offer






13. The process by which numerical data is converted into graphical images is referred to as:






14. This is not considered one of the four major categories of processing algorithms and rule approaches.






15. Generally Semantic Object Modeling (SOM) is consideredmore bottom-up oriented than _____________.






16. The process that records how data from operational data stores and external sources are transformed on the way into the warehouse is referred to as ________________.






17. An alternative to the data warehouse concept is a lower-cost - scaled-down version referred to as the _____________.






18. Which of the following is at the center of a star schema?






19. An ___________ relates two other objects.






20. Not the same as goodness-of-fit; We want to know how well the model predicts new data - not how well it fits the data it was trained with; Key component of most measures is difference between actual y and predicted y (error)






21. The product of two tables is also called the ________ product.






22. An analytical-oriented organizational structure is a data warehouse _____________.






23. The _______________________ represents the source data for the DW. This layer is comprised - primarily - of operational transaction processing systems and external secondary databases.






24. To add a new row to a table - use the _____ command.






25. The minimum cardinality and m is the maximum cardinality Cardinalities in Semantic Objects are shown as subscripts in the format n-m where _____






26. A single column that you create for an entity to serve as the primary key - because you otherwise would need many concatenated columns to do so - is called a(n) ____________.






27. 'Signatures' are used for intrusion detection by _______?






28. ___________ is not a characteristic of a data warehouse.






29. You can save the results of a query as a table by including the _____ clause in the query.






30. A common example of the use of association methods where a retailer can mine the data generated by a point-of-sale system - such as the price scanner you are familiar with at the grocery store is referred to as:






31. Semantic object link (SOL) attributes establish a relationship between one _______ and another.






32. Gives us an idea of the magnitude of errors. Actual value - estimated value.






33. When an entity has a minimum cardinality of one it means the entity is required in _______.






34. Gives an idea of systematic over- or under-prediction. Magnitude of average absolute error.






35. Within most organizations - the person known as the _____ determines the type of access various users can have to the corporate or enterprise database.






36. The deletion of a record that also deletes related records is referred to as a(n) _____.






37. Which rule would you be violating - if you tried to delete a sales rep record - who currently has customers on file?






38. Information about tables in the database is kept in the _____.






39. The set of activities used to find new - hidden - or unexpected patterns in data is referred to as _____.






40. A ___________ combines result sets from more than one fact table.






41. The SQL built-in functions - which may appear on the same line as the SELECT statement (before the FROM clause) are called _____ functions.






42. Organizes and analyzes data as an n-dimensional cube. The cube can be thought of as a common spreadsheet with two extensions: (1) support for multiple dimensions and (2) support for multiple concurrent users.






43. ____________ would not normally be associated with ROUTINE data warehouse maintenance.






44. The _____ operation of two tables results in a single table with the same columns as the first table - and containing all rows that are in the first table merged with all the rows in the second table - minus any duplicate rows.






45. A Star diagram has two types of tables (objects). They are called the___________________ tables and ; fact tables.






46. To create the primary key clause for the Customer table on the CustomerNum field - which of the following is the correct statement?






47. These are considered an alternate storage techniques for data warehousing include.






48. Why are Star Schemas so useful in Financial Planning and Accounting Information Systems?






49. ___________ determines exactly what level of detail constitutes a fact record.






50. The term _____ has been generally agreed to represent the broadest category of software technology that enables decision makers to conduct many dimensional analysis of consolidated enterprise data.