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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
 
Source Qualifier is an active t/r but there is no change of row count then y should we called it active t/r & Router , sorter some times no change in row count then Y we called its active t/r?   2
How many cubes create from a single model?   1
3. Suppose Seq Gen is supplying a increamental value to a column of a table, suppose, table's column value reaches to maximum value, then what will happen, will the session fail? If it is the situation, then what should be done so that we can stop this kind of situation in advance? Accenture 7
Without source how to insert record to target?   5
i have an aggregater in my mapping and no group by port on any column and i ampassing 100 rows through aggregater,so how many rows i will get as out put from aggregater   5
On a day, I load 10 rows in my target and on next day if I get 10 more rows to be added to my target out of which 5 are updated rows how can I send them to target? How can I insert and update the record?   6
1:when we develop a project what are the performance issue will raise?? KPIT 2:if a table have INDEX and CONSTRAINT why it raise the performance issue bcoz when we drop the index and disable the constraint it performed better??KPIT 3:what are unix commands frequently used in informatica?? KPIT 1
What is a unit Testing?   1
What are the different caches used in informatica? UST 3
How to convert flat file into xml file? How to tune joiner? Accenture 1
how to work with mapplet designer in informatica?   7
what is target update override and when we use it? TCS 2
 
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