CS614 Assignment 3 Solution and Discussion
Assignment No. 03
Semester: Fall 2019
CS614: Data Warehousing Total Marks: 15
Due Date: 27-Jan-2020
The objective of this assignment is to enhance the learning capabilities of the students about:
• Join Techniques
• Hash based join
• Sort-Merge join
Please read the following instructions carefully before submitting assignment:
You need to use MS word document to prepare and submit the assignment on VU-LMS.
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The assignment is submitted after due date.
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HyperMart is an online shopping store currently acquiring a large number of customers.
Normalized table structures for the shopping store are given below:
Order_ID Order_Date 100 2-Feb-2019 201 2-Feb-2019 300 4-Feb-2019 …. …
Order details Table
Detail_ID Order_ID Product_ID Product_Quantity Sale_Amount 100 100 2 1 100 101 100 3 2 200 200 201 5 1 50 201 201 7 1 90 300 300 15 1 600 301 300 56 1 800 302 300 57 1 850 …. … … …. …
• Assume 1:12 record count ratio between Order and Order detail for online store’s database
• Assume 10,000 orders
For the given relations you are required to calculate the following costs in terms of I/O operations and find out which joining technique is better for given scenario. Tasks you are required to perform are as under;
- Cost of Sort-Merge Join
- Cost of Hash-Join
- On the basis of your calculations, suggest better joining technique between sort-merge and hash join for the given scenario
Best of Luck!