Which of the following should be done to maintain and harden a hard disk? (Select the two best answers.)
A. Defragment the drive.
B. Consider a whole disk encryption.
C. Install third-party applications.
D. Sanitize the drive.
A and B. Defragmenting the hard drive is a good way to maintain the drive. Using whole disk encryption can harden the hard disk. It is unknown whether third-party applications can help to maintain or harden a hard disk; chances are they will do neither. Sanitizing the drive is the act of removing all the data.
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The rectangle in a flowchart indicates:
a. A process. b. An input or output instruction. c. A decision. d. A module to be processed.
Try to determine which sets of attributes form keys of R. How would you normalize this relation?
Consider the relation R, which has attributes that hold schedules of courses and sections at a university; R = {CourseNo, SecNo, OfferingDept, CreditHours, CourseLevel, InstructorSSN, Semester, Year, Days_Hours, RoomNo, NoOfStudents}. Suppose that the following functional dependencies hold on R: {CourseNo} -> {OfferingDept, CreditHours, CourseLevel} {CourseNo, SecNo, Semester, Year} -> {Days_Hours, RoomNo, NoOfStudents, InstructorSSN} {RoomNo, Days_Hours, Semester, Year} -> {InstructorSSN, CourseNo, SecNo}