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@zareen said in CS614 Assignment No.2 Solution and Discussion:

Question No. 2
Consider the following normalized tables for a telecommunication company showing the daily call record details of customers:
Customer_ID Customer Phone No. Balance
1 033XXXXX 300
2 033YYYYY 250
3 033ZZZZZZ 300
4 033AAAAA 1000
5 033BBBBB 80
6 033CCCCC 554
…
… …

Call_ID Customer_ID Dialed Phone Number Duration Call Charges
1 1 032ABCVD 1 minute 2 RS
2 1 032ABCVG 2 minutes 4 RS
3 1 032ABCVD 1 minute 2 RS
4 2 032ANNNN 3 minutes 6 RS
5 2 032AMMM 4 minutes 8 RS
6 3 033RRRRR 1 minute 2 RS
… … … … …

Due to certain performance factors company wants to de-normalize the tables using pre-joining technique.
Table Information is given below:
• Assume 1:4 record count ratio between customer Info (master) and Call record detail (detail).
• Assume 15 million customers.
• Assume 10 byte Customer_ID.
• Assume 50 byte header for customer Info (master) and 80 byte header for Call record detail (detail) tables.
You are required to perform the following tasks:
• Calculate the Total space in GBs used with normalization.
• Calculate the Total space in GBs used after de-normalization.

Solution:
With normalization:
Total space used = 15 x 50 + 60 x 80 = 5.55 GB

After de-normalization:
Total space used = (80 + 50 – 10) x 60 = 7.2 GB

@Faaizaa said in CS614 Assignment 2 Solution and Discussion Spring 2020:

Re: CS614 Assignment 2 Solution and Discussion

Assignment No. 2
Semester: Spring 2020
CS614 – Data Warehousing
Total Marks: 15

Due Date:
June 17, 2020

Objectives:
After completing this assignment, the students will be able to:
• De-Normalize the given table using horizontal splitting technique
• Calculate the Total space used with normalization.
• Calculate the Total space used after de-normalization.

Instructions
Please read the following instructions carefully before submitting assignment:
It should be clear that your assignment will not get any credit if:

• Assignment is submitted after due date.
• Submitted assignment does not open or file is corrupt.
• Assignment is copied (From internet/ to from students).
• Assignment is submitted other than word format (.doc, .docx).

Assignment

Question No. 1

Consider the following table having the information of students of a university:

Student ID Student Name Campus ID Student Age Degree Program 1 Ali VLHR01 27 MS 2 Kamran VISB01 24 BS 3 Akmal VRWP01 24 BS 4 Ahmad VLHR01 26 MS 5 Rehan VISB01 23 BS 6 Rizwan VRWP01 29 MS 7 Umer VISB01 25 BS 8 Javed VLHR01 26 MS

You are required to completely de-normalize the above table using “horizontal splitting” on the basis of Degree Program.

Question No. 2
Consider the following normalized tables for a telecommunication company showing the daily call record details of customers:

Customer Info Customer_ID Customer Phone No. Balance 1 033XXXXX 300 2 033YYYYY 250 3 033ZZZZZZ 300 4 033AAAAA 1000 5 033BBBBB 80 6 033CCCCC 554

…
… …

Call record detail Call_ID Customer_ID Dialled Phone Number Duration Call Charges 1 1 032ABCVD 1 minute 2 RS 2 1 032ABCVG 2 minutes 4 RS 3 1 032ABCVD 1 minute 2 RS 4 2 032ANNNN 3 minutes 6 RS 5 2 032AMMM 4 minutes 8 RS 6 3 033RRRRR 1 minute 2 RS

… … … … …

Due to certain performance factors company wants to de-normalize the tables using pre-joining technique.

Table Information is given below:

• Assume 1:4 record count ratio between customer Info (master) and Call record detail (detail).
• Assume 15 million customers.
• Assume 10 byte Customer_ID.
• Assume 50 byte header for customer Info (master) and 80 byte header for Call record detail (detail) tables.
You are required to perform the following tasks:

• Calculate the Total space in GBs used with normalization.
• Calculate the Total space in GBs used after de-normalization.

Deadline:
Your assignment must be uploaded on VULMS on or before June 17, 2020. While June 18, 2020 will be a bonus day for assignment submission. After the bonus day, no assignment would be entertained via email.

Solution file link

CS614 ASSIGNEMNT NO 01 Solution
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CS614 assignment Solution spring 2020.xlsx

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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 GB

Q. 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

@zareen said in CS614 Assignment 1 Solution and Discussion:

Assignment No. 1
Semester: Fall 2019
CS614 – Data Warehousing
Total Marks: 15

Due Date:
November 14, 2019

Objectives:
After completing this assignment the students will be able to:
• Identify Database entities from a given scenario
• Understand the database table structure
• Normalize a database table up to 2nd normal form
• De-normalize relationships using collapsing table technique

Instructions
Please read the following instructions carefully before submitting assignment:
It should be clear that your assignment will not get any credit if:

o Assignment is submitted after due date.
o Submitted assignment does not open or file is corrupt.
o Assignment is copied (From internet/ to from students).
o Assignment is submitted other than word format (.doc, .docx).

Assignment

Question No. 1

Consider the following schema related to a Social Media website named as ‘userPosts’. You have to perform following tasks related to the provided schema:

1- Identify appropriate keys for following structure (Primary and/or foreign key(s))
2- Convert this schema into 2 NF
userPosts (userID, userName, password, address, postId, postDate, postContent)

Question No. 2

Consider the following schemas relevant to a hotel booking website. You are required to De-Normalization the given schemas using Collapsing Tables Technique.

roomVisitor (roomID, visitorCNIC, dateTime)

roomCharges (roomID, spentDays, roomRent)

Deadline:
Your assignment must be uploaded on VULMS on or before November 14, 2019. While November 15, 2019 will be a bonus day for assignment submission. After the bonus day, no assignment would be entertained via email.

Q.1 Answer:

userDetails (userID, userName, password, address)
posts(postID, postDate, postContent)
userPosts (userID, postID)

• userID and postID in schema / table ‘userPosts’ are foreign keys

Q.2 Answer:
roomVisitorCharges (roomID, visitorCNIC, dateTime, spentDays, roomRent)

1_ As per Bill Inmost, a data warehouse, in contrast with classical applications is:

Data driven _ pg285

2_ Which of the following is NOT one of the three parallel tracks in Kimball’s approach?
Lifecycle Maintenance track

3_ Bill Inmon argues that requirements are well understood only after
Data warehouse is populated _ pg285

4_ Goal driven approach of data warehouse development was result of ______ work
Böhnlein and Ulbrich-vom _ pg285

5_ Identify the TRUE statement:
Clustering is unsupervised learning and classification is supervised learning _ pg 270

6_ Normally the term “DWH face to the business user” refers to:
Lifecycle Analytical Applications track _ pg 306

7_ In ________learning you don’t know the number of clusters and no idea about their attributes.
Unsupervised learning
https://www.cs.uic.edu/~liub/teach/cs583-fall-05/CS583-unsupervised-learning.ppt

8_ Waterfall model is appropriate when
Requirements are clearly defined _ pg 284

9_ Implementation of a data warehouse requires ________ activities.
none of above

10_ Normally the input data structure (a database table) for a data mining algorithm:
Has more number of records than attributes (not sure)

Answer will be same after convert.

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