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Kindly share today's paper 12-1-15
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Cs614_Midterm paper fall 2014 (Held On Dated 12-01-2015)
Total Questions: 26
Objective: 20 marks
2 questions each having 2 marks
2 questions each having 3 marks
2 questions each having 5 marks
Q.21Which cube operation changes the view of data? (2 marks)
Answer (page 80)
Pivot: change the view of data
Q.23 Change data capture (CDC) is most important step in data extraction. Why? (3 marks)
Answer (page 149)
Without Change Data Capture, database extraction is a cumbersome process in which you
move the entire contents of tables into flat files, and then load the files into the data
warehouse. This ad hoc approach is expensive in a number of ways.
Q.24 Identify the following statements as correct or incorrect. (3 marks)
"One of the basic function of OLTP is to show the historical background of an organization."
Answer (page 122)
OLTP & Slowly Changing Dimensions
• OLTP systems not good at tracking the past. History never changes.
• OLTP systems are not “static” always evolving, data changing by overwriting.
• Inability of OLTP systems to track history, purged after 90 to 180 days.
Actually don’t want to keep historical data for OLTP system
Q.25 List down any three ways of “handling missing data” during “data cleansing process”. (5 marks)
Answer (page 162)
• Dropping records.
• “Manually” filling missing values.
• Using a global constant as filler.
• Using the attribute mean (or median) as filler.
• Using the most probable value as filler.
Q.26 Suppose there is a table sale. Grain is “sales by day by product by store. Identify at least three facts so that sales table can easily be built. (5 marks)
Answer (page 74)
• Quantity sold
• Sales volume
• Total Rs.sales
Objective almost 40% from from moaaz files and subjective totally out of moaaz file all subjective was from last 10 lectures.
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fivestar1122 thanxxxx for sharing
fivestar1122 thanks for sharing..
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