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Q.1 Change data capture (Get ready) is most important step in information extraction. Why? (3 grades)
Answer (page 149)
Without Change Data Capture, collection extraction is a cumbersome process in which you
move the entire belongings in tables into flat records, and then load the information into the data
warehouse. That ad hoc approach is expensive in numerous ways.
Q.24 Find out the following statements Mbt Shoe Shops Melbourne as accurate or incorrect. (3 signifies) "One of the basic function of OLTP is to show the historical background of an organization."
Response (page 122)
OLTP Slowly Changing Size
OLTP systems not good at keeping track of the past. History never changes.
OLTP systems are not "static" always developing, data changing by overwriting.
Incapacity of OLTP systems to track background, purged after 90 to be able to 180 days.
Actually shouldn't keep historical data for OLTP system
Q.25 Take note of any three ways of "handling absent data" during "data cleansing process". (5 grades)
Answer (page 162)
Dropping Timberland Shop Sydney documents.
"Manually" filling missing values.
With a global constant as filler.
Using the Timberland Mens Shoes attribute mean (or maybe median) as filler.
With all the most probable value since filler.
Q.26 Think there is a table sale. Feed is "sales by day by product or service by store. Identify a minimum of three facts so that income table can easily be built. (A few marks) Answer (page 74)
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