What is normalization and denormalization in BW

Question

Hi,
i am new to BW i have searched few forums regarding this.
some people are telling the if the data in the table is divided in to two tables that is called normalization if suppose if we want to divide the data in to two tables on what condition we will divide. kindly can any one tell me with the example i am confused with this topic.
Thanks & Regards,
Naveen

Answer 1

Hi,
If a table contain below three  statements
DATA REDUNDENCY
COMPLEXITY OF DATA
DATABASE STORAGE CAPACITY
that table is called as DE-NORMALIZED table.
So we need to convert these de-normalized tables into normalized tables are called as NORMALIZATION.
We have some predefined NORMAL forms based on that we can devide that table.
Example:
CNO    MNO   ADDRESS      PRICE
C100   M100   INDIA             100
C200   M200   INDIA             200
C300   M300   INDIA             300
C400   M400   INDIA             500
C500   M500   INDIA             600
In above example  see the address  all the customers having the same address.  So insted of entering the same address for all the customers we can create the other table for ADDRESS and we maintain all the address in that table.and refer that table for each and customer to get the corresponding address.
If we have C100 customer transactions 200 times in this case, why should i enter the same address 200 times, it gives the data redundency. So i can maintain the C100 address in Address table and refer that address for C100.
I hope that example will help you.
Regards,
Yerrabelli.