CS614 Assignment 2 Solution and Discussion
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Assignment No. 02
Semester: Fall 2019
CS614: Data Warehousing Total Marks: 10Due Date: November 28, 2019
Objective:
The objective of this assignment is to enhance the learning capabilities of the students about:
• De-Normalization
• Pre-Joining
• Storage Issues of Pre-joiningInstructions:
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Question
“Kare Pharma” is an online Medical store currently acquiring a large number of customers. To manage some performance issues this online Medical store requires to de-normalize its database using pre-joining technique for Prescription and Prescription details tables.
Normalized table structures are given below:
Prescription Table
Prescription_ID Patient_Name Doctor_Name Prescription_Date …. … Prescription details Table
Transaction_ID Prescription_ID Med_ID Med_Quantity Sale_Amount …. … … …. … Table Information
• Assume 1:11 record count ratio between Prescription table as master table and Prescription details table for online Medical store’s database.
• Assume 10 million records in Prescription Table.
• Assume 10 bytes reserved for Prescription_ID in memory.
• Assume 40 bytes header for master table and 70 bytes header for details table.Task
You are required to perform the following tasks:
- Calculate the total space reserved in memory using normalization
- Calculate the total space reserved in memory after de-normalization using pre-joining technique
Best of Luck!
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@zareen said in CS614 Assignment 2 Solution and Discussion:
Calculate the total space reserved in memory using normalization
Q. 1. Calculate the total space reserved in memory using normalization1. Calculate the total space reserved in memory using normalization
Q. 1 Solution:
Total space used
= 10 (Million records) x 40 (Bytes header) + 110 (Million records) x 70 (Bytes header)
= (1000000040) + (11000000070)
=8,100,000,000
= 8.1 GBQ. 2. Calculate the total space reserved in memory after de-normalization using pre-joining technique
Q. 2 Solution:
Total space used
= (70 + 40 – 10) (Bytes header) x 110 (Million records)
=100*110000000
=11,000,000,000
= 11 GB