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Question
Difference between flat files and relational sources?
 Question Submitted By :: Jakki
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Difference between flat files and relational sources?
Answer
# 1
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
 
  Re: Difference between flat files and relational sources?
Answer
# 2
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
 
 
 

 
 
 
Other ETL Interview Questions
 
  Question Asked @ Answers
 
what is pmrep command?   1
what types of repositories we can create in informatica? in real time in which type of repository we will work on?   2
Hi, Lookup() is what kind of join ? Satyam 5
if u can't find what you are looking for in lookup table, how do you handle?   1
How can write SQL Overwrite to get Daynamic rows from the source in SQ transformation!(Any Example)   1
how do u implement scheduling in Informatica? Cognizent 1
Hi please try to reply with answer. my mail id is raghu.1028@gmail.com. if the source is having millions of records, but having theree target tables. As per user the first record need to insert into first target and second record in to a second target and third into third target, similarly the process needs to repeat?   4
what are the different Reporting and ETL tools available in the market?   1
how do u implement unconn.stored proc. in a mapping?   1
you have created a lookup transformation for a certain condition which if true returns multiple rows. when you go to the target and see only one row has come and not all. why is it so and how it can be corrected.   3
what are Lookup caches options? Including persistent caches.   1
Difference between flat files and relational sources?   2
 
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