cs351midtermFall09

cs351midtermFall09 - Bilkent University Department of...

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Bilkent University Department of Computer Engineering CS351 DATA ORGANIZATION AND MANAGEMENT Midterm Exam Date: November 7, 2009 Time: 13:15 -15:15 I Student Name/ ID No. Section Notes: 1. There are 100 points, 6 questions on 6 pages. 2. Please READ the questions. It is a closed book/notes exam. 3. Show your work . 4. You are not allowed to use your cell phone or PDA for any purpose. 5. You cannot leave the exam room in the first 30 minutes. 6. Please do not write anything inside the following table . . No. Q1 Points Possible 18 Your Grade 6 Overall 20 100 1 . (18%) Consider a file of 120 Mbytes with record size 100 bytes stored on a disk drive wi th the disk parameters given below: s=20 msec, r=10 msec. btt=1 . 00 msec , ebt=1 . 10 msec. and block s i ze 2400 b y tes . a) Compute Tx (Exhaustive reading of the entire file.) b) Compute T F (Average time to Fetch or Access a single record) c) How many records can be read randomly in time Tx?
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1600 bytes / inch recording density 0.5 inches Inter Block Gap 2500 feet tape length of a reel (30000 inches) 10 msec. of start / stop time 200 inches / sec read / write speed
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cs351midtermFall09 - Bilkent University Department of...

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