Question 1: A university has a data warehouse whose conceptual level design is a

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Question 1: A university has a data warehouse whose conceptual level design is as follows uni fact table student id course semester id instructor id count avg grade course student dimension table dimension table course id student id student name area id major status univerSi course name semester dimension table semester id instructor dimension table semester nstrnictor id dept rai Answer th 1. e following questions Starting with the base cuboid, what specific OLAP operations (for example, roll-up from semesters to year) should you perform in order to list the average grade of CS courses for each student. 2. Consider the data cube corresponds to this design, how many cuboids will it contain itf 1) There is NO hierarchy in each of the dimension 2) Each dimension has a hierarchy that contains five different levels, for example, "student

Explanation / Answer

1.The specic OLAP operations to be performed are.Starting with the base cuboid [student, course, semester, instructor]

1. roll-up on course from (course_key) to major

2. roll-up on student from (student_key) to university

3. Dice on course, student with department =”CS” and university=”University”

4. Drill-down on student from university to student name

2. 1-When there is no hierarchy then number of cuboids will be 2^n,such that 2^4=16 cuboids.

2-This cube will contain 5^4= 625 cuboids

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