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what is normalization? explain 1st NF, 2nd NF, 3rd NF
 Question Submitted By :: Informatica
I also faced this Question!!     Answer Posted By  
# 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.


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

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

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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
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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
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what is target update override and when we use it? TCS 2
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