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Question
what is normalization? explain 1st NF, 2nd NF, 3rd NF
 Question Submitted By :: Informatica
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Data normalization is a process in which data attributes
within a data model are organized to increase the cohesion
of entity types. In other words, the goal of data
normalization is to reduce and even eliminate data
redundancy, an important consideration for application
developers because it is incredibly difficult to stores
objects in a relational database that maintains the same
information in several places.

Level
Rule

First normal form (1NF)
An entity type is in 1NF when it contains no repeating
groups of data.

Second normal form (2NF)
An entity type is in 2NF when it is in 1NF and when all of
its non-key attributes are fully dependent on its primary
key.

Third normal form (3NF)
An entity type is in 3NF when it is in 2NF and when all of
its attributes are directly dependent on the primary key.

 
Is This Answer Correct ?    15 Yes 2 No
Rakesh
 

 
 
 
Other Informatica Interview Questions
 
  Question Asked @ Answers
 
what is confirmed fact?   2
i did MBA in 2008. i got job as a Software Engineer(Informatica) in 2008 February in our college campus interviews through consultancy. my problem is when iam going interview HR people ask " YOu are MBA graduate how u get software(informatica) job". iam saying i got job in campus interviews. i have knowledge in informatica in dataware housing. is this answer correct or not. plese give me guidence IBM 1
what are the reusable tasks in informatica ? IBM 11
what is incremantal aggregation?   1
Which kind of index is preferred in DWH?   2
which one is costliest transformation? costliest means occupying more memory. which one Aggregator,sorter,filter,etc.. TCS 7
What are the disadvantages of Sequence Generator T/R? Zensar 3
how to get the first row without using rank t/r? iGate 6
How to calculate the cache size if say we are doing a performance check on a mapping and found that a particular cache needs to be changed. Is there a formula to calculate this! i know that informatica has a auto option available but how to calculate manually?   1
what are the difference between Informatica 7.1 and 8.1?   6
What is Code Page Compatibility?   1
In update strategy t/r we had given dd_insert condition & in session we gave delete condition . Then what will happen? mapping will run ? emc2 2
 
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