Interested to Buy Any Domain ? << Click Here >> for more details...
Discuss the advantages & Disadvantages of star & snowflake
schema?
- 5 Answers
- 46531 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / alhad kulkarni
The question is Advantages and Disadvantages, not What is
Star or Snowflake.
Star Adv: Reduced Joins, Faster Query Operation.
Snow Adv: Distributed data, Easier to obtain fact-less data
e.g. Orders Shipped across one Quarter.
Star DisAdv: Bigger table sizes, Too many rows in Fact Table
Snow DisAdv: More number of joins, Slower Query operation,
| Is This Answer Correct ? | 78 Yes | 1 No |
Answer / ravi sadanand
Star Schema: It is fully denormalized schema.the diagram of
fact table with dimension tables resembles a star that's
why it is called star schema.All the dimensions will be in
2nd normal form.
Snow flow schema:In this all dimensions will be in
normalized form.that's why it is called normalized star
schema.For each attribut a seperate table will be
created.As there is a possibility for more number of
joins,obviously the performance will be degraded.
| Is This Answer Correct ? | 34 Yes | 11 No |
Answer / susanta karmakar
Star Schema: A star schema is a specialized design that
consists of multiple dimension tables, which describe
aspects of a business, and one fact table, which contains
the facts about the business.For example, if you have a
mail-order business selling books, some dimension tables are
customers, books, catalogs, and fiscal years. The fact table
contains information about the books that are ordered from
each catalog by each customer during the fiscal year.
| Is This Answer Correct ? | 8 Yes | 7 No |
Answer / hania
Star Schama : easy for users to understand, optimize navigation and more suitable for query processing, and works faster.
Disadvantages: Dimension table have greater rows, large fact table
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / krishna
in starschema the fact is denormalised ...all dimension
tables are normalise..there will be primary foreignkey
relation ship between fact and dimension tables.
for better perfomance we use starschema when compare to
snow flake schema ..where fact table and dimension tables
are normalised...for every dimension table tthere will be a
look table ..we have to dig from top to bottom in the
snowflake schema.
| Is This Answer Correct ? | 18 Yes | 28 No |
What is mapplet in informatica?
in my lookup table i want to catch the recently updated records from the source to target,how to achieve this and what is last commit interval point for this?
Explain the flow of data in Iinformatica?
can any one explain me about junk dimension
while for 100 records in source table loaded sucessfully in trgt table . assume ,session will take 10min or 5 min to successfully succeeded. then 100 million records r there in source how much time will take by session to succeeded. there no fail ok.trgt table will load 100 million records with out any errors . don't tell perfect time . assume your self how much time to succeeded?
How will you combine 3 different sources with a single source?
performance wise which one is better in joiner and lookup transformation
How to use procedural logic inside infromatica?
what is SDLC way of code development?
What if the source is a flat-file?
What is the capacity of power cube?
Difference between STOP & ABORT in Informatica.
3 Answers Accenture, Wells Fargo,
Teradata 
