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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
 
I have a scenario like - how can i load 1st record to Trgt1,2nd->Trgt2, 3rd->Trgt3 and again the cycle has to repeat with loading 4th->Trgt1,5th->Trgt2,6th->Trgt3? ITC-Infotech 3
What is joiner cache? TCS 1
What is diff between connected and unconnected lookup? BirlaSoft 5
can you please explain me pre session and post session options?   3
sir presently i am persuing my m.tech recently i got job in tcs as fresher presently iam doing my 9 months project related to informatica can any one guide me how to create fact tables what type of schemas must be used and so on if so give ur mail ids so that i can contct through it   1
i have thousand records in my source(flat file) i wanna load 990 records i don't want load first 5 records and last 5 records at informatica level? Satyam 2
Can any one describe what is audit table briefly?how does it look like and what are the columns in it? Syntel 3
How to improve the session performance in informatica? Accenture 3
What are the types of maping wizards that r to be provided in Informatica?   2
If we use only lookup transformation in a mapping ie, SourceQualifier-->Lookup --> Target. , here datas are taking very long time to load in target., so what are steps to improve the performance in that mapping???????   2
what are surrogate keys?   5
I've an excel sheet, in which one column contains data about the location like "City, State" and few columns contains only "State". Now I wanna load into my target City and State into two different columns. Pls help me out... TCS 6
 
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