The university computer lab's director keeps track of the lab usage, as measured by the number of students using the lab. This particular function is very important for budgeting purposes. The computer lab director assigns you the task of developing a data warehouse in which to keep track of the lab usage statistics. The main requirements for this database are to

• Show the total number of users by different time periods.

• Show usage numbers by time period, by major, and by student classification.

• Compare usage for different major and different semesters.

USELOG contains the student lab access data

STUDENTis a dimension table containing student data

Given the three preceding requirements, and using the Ch13_P1.mdb data, complete the following problems:

a. Define the main facts to be analyzed.

b. Define and describe the appropriate dimensions.

c. Draw the lab usage star schema, using the fact and dimension structures you defined in Problems 1a and 1b.

d. Define the attributes for each of the dimensions in Problem 1b.