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Question
Difference between flat files and relational sources?
 Question Submitted By :: ETL
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
if ur sources are flat files then you cannot give any SQ
override queries.

to join 2 flatfile sources you need to have a joiner
transformation.

If ur target is a flat file, the loading process is very
fast as its a bulk load where there will be no constraints
( no checks)

You can have number and char data types... but for dates,
you need to convert explicitly

many more diff are there...

You can use indirect method and use many flatfiles of same
structure and load to a target using one session and
workflow tasks.
 
Is This Answer Correct ?    4 Yes 1 No
Prasanna
 
Answer
# 2
FLAT FILES SOURCES WILL WITHOUT PRIMARY KEY AND ALL THE
COLUMN DATATYPES WILL BE SIMILER. I.E--CHAR.
RELATIONAL SOURCES WILL BE WITH PRIMARY KEY AND FOREIGN KAY
REALTION SHIP
THIA IS THE MAIN DIFFERENCE,A LOT OF SMALL DIFFERENCES ARE
THEIR.
 
Is This Answer Correct ?    3 Yes 1 No
Maruthi
 
 
 

 
 
 
Other ETL Interview Questions
 
  Question Asked @ Answers
 
Can anyone please send me the latest informatica dumps (power center 8.1.1) for all the three exams? My mail id is yokilamai@gmail.com   1
what is HISTOGRAM? how to generate statistics?   1
what is a test load?   3
what is SMP AND MPP?   7
what are the different forms of normalization?   2
Eliminating of duplicate records without using dynamic lookups   3
Can we parametrize the values of IN statement. Ex. Inside parameter file: Parameter='A','B','C' Inside Code: IN (INPUT_CHARACTER, $$Parameter) Cognizent 2
how to answer the question "explain project architecture" in informatica pls any one who has the answer pls send the answer to this mail id "karumanchisrinu@gmail.com TCS 1
how do u automate Extraction process?   1
what is the indicator file and where it is used?   1
working of line item dimension......pls,tell overall flow   1
How can we handle Rejection Logic in Source tables while we are matching the data in Target side in ETL Testing ?   2
 
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