2. Parikshit Savjani is a Premier Field Engineer with Microsoft with
specialization on SQL Server and Business Intelligence (SSAS,SSIS
and SSRS).His role involves consulting,performance
tuning,delivering workshops,chalk talks to Premier Customers of
Microsoft environment. He has 4.5 years of experience with
Microsoft & SQL Server.He contributes to the community by
Blogging his learnings on this site, www.sqlserverfaq.net & MSDN
Blogs
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14. Provides context to slice the data Measures of interest.
Maps to the Master Table of the OLTP system maps Maps to Transactional table of OLTP system.
Should be Denormalized & should be 1st NF Are in 3 NF
Are wide in nature. Narrow in Nature
Comparatively shallow as compared to Fact Tables. Very Deep contains rows for every transaction
Include as many columns as you can think of Aggregated in the context of the Dimensions
Are related to only Fact table and otherwise should Consists of Key Columns and Measure Columns
be unrelated
15. The shape looks like a Star
A Star Schema contains a fact
table and one or more
dimension tables.
1. A Fact Table: The central fact
table store the numeric fact
(measures) such as Sales
dollars, Costs, Unit Sales etc.
2. Dimension Tables: They
surround the central fact
table, and they store
descriptive information about
the measures
16. If there are m dimensions and if each dimension has n
rows, the theoretical size of the Cube is m*n.
Addition of one redundant Dimension can increase the
size of the Cube by large amount.
