Which of the following Windows utility programs arranges pieces of files on your hard drive to allow for faster access?
A) Task Manager B) Disk Cleanup
C) Disk Defragmenter D) Error-checking
C
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Implement this physical design for DreamHome created in 18.7.
What will be an ideal response?
Consider the following schema:
Professor(Id: INTEGER,Name: STRING,DeptId:DEPTS)
Teaching(ProfId:INTEGER,CrsCode:COURSES,Semester:SEMESTERS)
Transcript(StudId:INTEGER,CrsCode:COURSES,Semester:SEMESTERS,Grade:GRADES)
(a) Write a SELECT statement that returns the course code of every course that has ever
been taught by a professor whose DeptId is 'CS'.
(b) Translate the above statement into an equivalent relational algebra expression. Briey
describe the evaluation procedure that your expression specifies.
(c) Translate the following relational algebra expression into an SQL statement.
If two devices simultaneously transmit data on an Ethernet network and a collision occurs, what does each station do in an attempt to resend the data and avoid another collision?
a. Each device compares the other device's priority value (determined by IP address) with its own, and the device with the highest priority value transmits first. b. Each device waits for a clear to send (CTS) signal from the switch. c. Each device randomly picks a priority value, and the device with the highest value transmits first. d. Each device sets a random back off timer, and the device will attempt retransmission after the timer expires.
Which light property controls the amount of surface reflection on the lighted surface?
A. Gloss B. Material C. Ambience D. Exposure