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CS614 Assignment No.2 Solution and Discussion


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    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!



  • 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


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