<![CDATA[CS614 Assignment No.2 Solution and Discussion]]>57dcc8d1-998d-408e-93e3-e66d5d483838-image.png
Assignment No. 02
 Semester: Spring 2019
CS614: Data Warehousing
Total Marks: 10 Due Date: 30-May-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-joining

Instructions:
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.
It should be clear that your assignment will not get any credit if:

♣ The assignment is submitted after due date.
♣ The assignment is not in the required format (.doc or docx)
♣ The submitted assignment does not open or file is corrupt.
♣ Assignment is copied(partial or full) from any source (websites, forums, students, etc)

Assignment

Question

HyperMart is an online shopping store currently acquiring a large number of customers. To manage some performance issues this online store requires to de-normalize its database for order and Order detail tables.
Normalized table structures are given below:

1385b3a1-4d68-433e-9617-aaf2ee04e112-image.png

Table Information

• Assume 1:12 record count ratio between Order master and Order detail for online store’s database
• Assume 10 million orders (120 million records in order detail).
• Assume 10 byte Order_ID.
• Assume 30 byte header for master and 60 byte header for detail tables.

Task

You are required to perform the following tasks:

  1. De-normalize the given tables using Pre-joining technique
  2. Calculate the total space used with normalization
  3. Calculate the total space used after de-normalization

Best of Luck!

]]>https://community.secnto.com//topic/74/cs614-assignment-no-2-solution-and-discussionRSS for NodeMon, 08 Jun 2026 19:53:22 GMTFri, 31 May 2019 10:07:54 GMT60<![CDATA[Reply to CS614 Assignment No.2 Solution and Discussion on Fri, 31 May 2019 16:52:41 GMT]]>CS614 Assignment Solution

DENORMALIZED Table

  1. DE normalization using pre-joining

In pre-joining all columns are moved from the master table into the detail table

a84b7c27-f4c1-4db4-8794-16a47960ec01-image.png
Detail table
2) Calculate the total space used with normalization

SOL:

Total space with normalization
= (H.S of master table * records in master table) + (H.S of detail table * records in detail table)
= (30 * 10) + (60 * 120)
= 300 + 7200
= 7.5 GB

¥ Calculate the total space used after de-normalization
Total space after de-normalization
= (H.S of detail table + H.S of master table – common join path (orde_id)) * (records in detail table)
= (60 + 30 - 10) * 120
= 80 * 120
=9600
9.6 GB

CS614-Assignment-Solution(72G6dF).docx

]]>https://community.secnto.com//post/135https://community.secnto.com//post/135Fri, 31 May 2019 16:52:41 GMT