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CS614 Data Warehousing Assignment No.2 (Graded) Spring 2014 Due Date: 26 May 2014

Data warehousing (CS614)

Assignment # 2 (GRADED)

Total marks = 20

                                                                                       Deadline Date = 26/05/2014

Please carefully read the following instructions before attempting the assignment.

 

Rules for Marking

It should be clear that your assignment would not get any credit if:

 

  • The assignment is submitted after due date.
  • The submitted assignment does not open or file is corrupt.
  • The assignment is copied. Note that strict action would be taken if the submitted assignment is copied from any other student. Both students will be punished severely.

 

1)      You should consult recommended books to clarify your concepts as handouts are not sufficient.

2)      You are supposed to submit your assignment in .doc format. Any other formats like scan images, PDF, Zip, rar, bmp, docx etc will not be accepted

3)      You are advised to upload your assignment at least two days before Due date.

4)      This assignment file comprises of Two (2) pages.

 

 

Important Note: 

 

Assignment comprises of 20 Marks. Note that no assignment will be accepted after due date via email in any case (whether it is the case of load shedding or emergency electric failure or internet malfunctioning etc.). Hence, refrain from uploading assignment in the last hour of the deadline, and try to upload Solutions at least 02 days before the deadline to avoid inconvenience later on.

 

For any query please contact: CS614@vu.edu.pk

Assignment No. 2

Consider the business process “exams_sessions_papers_aggregate”. The entities involved in the process are shown in above portion of ERD. The process calculates the information that can be sampled as follows:

 

“Totally 100 papers were conducted in exam center “VU001” in morning session in Fall 2013 exam”.

 

“Totally 110 papers were conducted in exam center “VU002” in evening session in Spring 2013 exam”.

 

“Totally 150 papers were conducted in exam center “VU001” in evening session in Fall 2013 exam”.

 

Question:

 

There are four steps of dimensional modeling. First step is to identify the business process. Consider the “exams_sessions_papers_aggregate” process described above. Apply the remaining steps of dimensional modeling to find out the fact and dimensional table(s).

 

Note: You are required to show these steps in solution as well.

 



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Replies to This Discussion

Assignment file..

Attachments:

Plz Share ur Ideas here .

Anybody home.......!!!!!!!!

Please Discuss here about this assignment.Thanks

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

This is the Idea Solution of assign.......

Attachments:

thnx for sharing,,,,, 

Muhammad Zain Kaleem Gud keep it up & thanks for sharing 

Note for All Members: You don’t need to go any other site for this assignment/GDB/Online Quiz solution, Because All discussed data of our members in this discussion are going from here to other sites. You can judge this at other sites yourself. So don’t waste your precious time with different links.

thnx for sharing ur idea will help a lot

Muhammad zain bro thankx for sharing ur idea...

but explain it, how do it????

Dimensional modeling

Dimensional modeling (DM) is the name of a set of techniques and concepts used in data warehouse design. It is considered to be different from entity-relationship modeling (ER). 

Dimensional modeling always uses the concepts of facts (measures), and dimensions (context). Facts are typically (but not always) numeric values that can be aggregated, and dimensions are groups of hierarchies and descriptors that define the facts. 

Dimensional modeling process
The dimensional model is built on a star-like schema, with dimensions surrounding the fact table. To build the schema, the following design model is used:


Choose the business process
Declare the grain
Identify the dimensions
Identify the fact

Choose the business process
The process of dimensional modeling builds on a 4-step design method that helps to ensure the usability of the dimensional model and the use of the data warehouse. The basics in the design build on the actual business process which the data warehouse should cover. Therefore the first step in the model is to describe the business process which the model builds on. This could for instance be a sales situation in a retail store. To describe the business process, one can choose to do this in plain text or use basic Business Process Modeling Notation (BPMN) or other design guides like the Unified Modeling Language (UML).

Declare the grain
After describing the Business Process, the next step in the design is to declare the grain of the model. The grain of the model is the exact description of what the dimensional model should be focusing on. This could for instance be “An individual line item on a customer slip from a retail store”. To clarify what the grain means, you should pick the central process and describe it with one sentence. Furthermore the grain (sentence) is what you are going to build your dimensions and fact table from. You might find it necessary to go back to this step to alter the grain due to new information gained on what your model is supposed to be able to deliver.


Identify the dimensions
The third step in the design process is to define the dimensions of the model. The dimensions must be defined within the grain from the second step of the 4-step process. Dimensions are the foundation of the fact table, and is where the data for the fact table is collected. Typically dimensions are nouns like date, store, inventory etc. These dimensions are where all the data is stored. For example, the date dimension could contain data such as year, month and weekday.


Identify the facts
After defining the dimensions, the next step in the process is to make keys for the fact table. This step is to identify the numeric facts that will populate each fact table row. This step is closely related to the business users of the system, since this is where they get access to data stored in the data warehouse. Therefore most of the fact table rows are numerical, additive figures such as quantity or cost per unit, etc.

Assignment No. 2

Consider the business process “exams_sessions_papers_aggregate”. The entities involved in the process are shown in above portion of ERD. The process calculates the information that can be sampled as follows:

“Totally 100 papers were conducted in exam center “VU001” in morning session in Fall 2013 exam”.

“Totally 110 papers were conducted in exam center “VU002” in evening session in Spring 2013 exam”.

“Totally 150 papers were conducted in exam center “VU001” in evening session in Fall 2013 exam”.

Question:

There are four steps of dimensional modeling. First step is to identify the business process. Consider the “exams_sessions_papers_aggregate” process described above. Apply the remaining steps of dimensional modeling to find out the fact and dimensional table(s).

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