Assignment No. 2
Semester Fall 2015
The assignment has been designed to develop your ability to design star schema and to estimate the rows in fact table.
Please read the following instructions carefully before solving & submitting assignment:
For any query about the assignment, contact only at CS614@vu.edu.pk
Do not post queries related to assignment on MDB.
Question 1 [15 Marks]
The Future Tech College has to design a star schema related to the grades for courses completed by the students. The tables with the attributes are as given below.
You have to;
You may use the MS Vision or any other similar tool to draw the Star Schema.
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sir tariq sahib please help for above given link
konsa link bhai
can we use ms word for draw star Sachema????????
bana li he apne schema ?
What is star schema? The star schema architecture is the simplest data warehouse schema. It is called a star schema because the diagram resembles a star, with points radiating from a center. The center of the star consists of fact table and the points of the star are the dimension tables. Usually the fact tables in a star schema are in third normal form(3NF) whereas dimensional tables are de-normalized. Despite the fact that the star schema is the simplest architecture, it is most commonly used nowadays and is recommended by Oracle.
A fact table typically has two types of columns: foreign keys to dimension tables and measures those that contain numeric facts. A fact table can contain fact's data on detail or aggregated level.
A dimension is a structure usually composed of one or more hierarchies that categorizes data. If a dimension hasn't got a hierarchies and levels it is called flat dimension or list. The primary keys of each of the dimension tables are part of the composite primary key of the fact table. Dimensional attributes help to describe the dimensional value. They are normally descriptive, textual values. Dimension tables are generally small in size then fact table.
Typical fact tables store data about sales while dimension tables data about geographic region(markets, cities) , clients, products, times, channels.
The main characteristics of star schema:
Simple structure -> easy to understand schema
Great query effectives -> small number of tables to join
Relatively long time of loading data into dimension tables -> de-normalization, redundancy data caused that size of the table could be large.
The most commonly used in the data warehouse implementations -> widely supported by a large number of business intelligence tools
but we need diagram ?
koi solution send kry
i did not understand to this assignment