Question 49 Not yet answered Flag question Question text In which scenario would you use a data warehouse? Question 49Answer a. For real-time transaction processing b. For cloud storage c. None of these d. For storing historical data e. For simple data retrieval Question 50 Not yet answered Flag question Question text What is the purpose of data normalization? Question 50Answer a. To increase redundancy b. To simplify queries c. To reduce data anomalies d. To enhance security e. None of these Question 51 Not yet answered Flag question Question text Which of the following is a characteristic of a centralized database? Question 51Answer a. Requires internet access b. Data spread across multiple locations c. Data stored in various formats d. None of these e. Users access the data even from a remote location Question 52 Not yet answered Flag question Question text What is meant by 'atomic' attribute values? Question 52Answer a. None of these b. Values that can be divided into smaller parts c. Values that are indivisible d. Values that are always null e. Values that can change frequently Question 53 Not yet answered Flag question Question text Which of the following operators is used to perform set difference in relational algebra? Question 53Answer a. ∩ b. None of these c. × d. − e. ∪ Question 54 Not yet answered Flag question Question text Which of the following operations retrieves only specific columns from a relation? Question 54Answer a. Select b. Join c. Union d. Project e. None of these Question 55 Not yet answered Flag question Question text Which of the following statements about the relational model is true? Question 55Answer a. It is complex and difficult to understand b. It abstracts away the details of data storage c. It requires a hierarchical structure d. It is based on object-oriented principles e. None of these
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Question 15: Which of the statements about database normalization is true? Statements: i) Database normalization improves data redundancy, saves on storage space, and fulfills the requirement of records to be uniquely identified. ii) Database normalization supports up to 3rd normal form and removes all data anomalies. iii) Database normalization removes inconsistencies which may cause the analysis of our data to be more complicated. iv) Database normalization increases data redundancy, saves on storage space, and fulfills the requirement of records to be uniquely identified. Options: - (i), (ii) - (i), (iii) - (ii), (iv) - (iii), (iv)
Akash M.
8-50. Consider the following normalized relations from a database in a large retail chain: STORE (StoreID, Region, ManagerID, SquareFeet) EMPLOYEE (EmployeeID, WhereWork, EmployeeName, EmployeeAddress) DEPARTMENT (DepartmentID, ManagerID, SalesGoal) SCHEDULE (DepartmentID, EmployeeID, Date) What opportunities might exist for denormalizing these relations when defining the physical records for this database? Under what circumstances would you consider creating such denormalized records? 8-51. Consider the following set of normalized relations from a database used by a mobile service provider to keep track of its users and advertiser customers. USER (UserID, UserLName, UserFName, UserEmail, UserYearOfBirth, UserCategoryID, UserZip) ADVERTISERCLIENT (ClientID, ClientName, ClientContractID, ClientZip) CONTACT (ContactID, ContactName, ContactEmail, ContactPhone) USERINTERESTAREA (UserID, InterestID, UserInterestIntensity) INTEREST (InterestID, InterestLabel) CATEGORY (CategoryID, CategoryName, CategoryPriority) ZIP (ZipCode, City, State) Assume that the mobile service provider has frequent need for the following information: • List of users stored by zip code • Access to a specific client with the client’s contact person’s name, email address, and phone number • List of users stored by interest area and within each interest area user’s estimated intensity of interest • List of users within a specific age range stored by their category and within the category by zip code • Access to a specific user based on their email address Based on these needs, specify the types of indexes you would recommend for this situation. Justify your decisions based on the list of information needs above. 8-52. Consider the relations in Problem and Exercise 8-51. Identify possible opportunities for denormalizing these relations as part of the physical design of the database. Which ones would you be most likely to implement?
Supreeta N.
Which of the following is not a step of database design? a. Identify the entities involved b. Identify the unique identifiers for the entities c. Identify the attributes for all the entities d. Identify the functional dependencies that exist among the attributes e. All of the above f. None of the above Data anomalies are classified into which of the following four categories? a. Updates, additions, deletions, and concurrent data b. Updates, additions, deletions, and consistent data c. Updates, additions, deletions, and inconsistent data d. Updates, additions, deletions, and unnormalized data What is an attribute? a. An attribute is another name for relationship. b. An attribute is another name for entity. c. An attribute is a property of an entity. d. An attribute is a property of a relationship. What is a relationship? a. A relationship is an association between two attributes. b. A relationship is an association between entity and attribute. c. A relationship is an association between two entities. d. A relationship is an association between two relations.
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