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INTERVIEW QUESTIONS I FAQ GUIDE
Informatica
Q1>How do u change parameter when u move it from development to
production.
Ans :: We can manually move the parameter file and save in prod server. (Posted
:: Vijay )
Q2>How do u retain variable value when u move it from development to
production.
Ans :: while moving the variables to prod make sure that you assign the default
value while creating the variables in dev environment.when the code was moved
it will check the repository and see if there is any value for that variable if
there is no value then it takes the default value. (Posted :: Vijay )
Q3>How do u reset sequence generator value u move it from development to
production
Ans :: Keep the sequence value as 1 in
dev and move the code to prod. (Posted :: Vijay )
Q4>How to delete duplicate values from UNIX.
Ans :: UNIQ <filename>
Q5>How to find no.of rows commited to the target, when a session fails.
Ans :: Log file
Q6>How to remove the duplicate records from flat file (other than using
sorter trans. and mapping variables)
Ans :: (i)Dynamic Lookup (ii) sorter and aggregator
Q7>How to generate sequence of values in which target has more than 2 billion
records. (with sequence generator we can generate up to 2 billion values only)
Ans :: Create a Stored Procedure in database level and call it using stored procedure
transformation.
Q8>I have to generate a target field in Informatica which doesn exist
in the source table. It is the batch number. There are 1000 rows altogether.
The first 100 rows should have the same batch number 100 and the next 100 would
have the batch numbe 101 and so on. How can we do using informatica?
Ans :: develop a mapping flow
Source > sorter > sequencegenerator (generate numbers)> expression
(batchnumber , decode function) > target
Expression :: decode(nexval<=100, nextval ,
Nextval>100 and Nextval<=200,Nextval+1,
Nextval>200 and nextval<=300,nextval+2 ,
Nextval>900 and nextval<=1000,nextval+10,0 )
9>Lets take that we have a Flat File in the Source System and It was in
the correct path then when we ran the workflow and we got the error as
"File Not Found", what might be the reson?
Ans :: Not entered “source file name” properly at the session level
Q10>How to load 3 unstructured flat files into single target file?
Ans :: Indirect file option (configure at session level)
Q11>There are 4 columns in the table
target Definition ::
Store_id, Item, Qty, Price
101, battery, 3, 2.99
101, battery, 1 , 3.19
101, battery, 2, 2.59
Source Definition::
101, battery, 3, 2.99
101, battery, 1 , 3.19
101, battery, 2, 2.59
101, battery, 2,17.34
How can we do this using Aggregator?
Ans :: Source > aggregator (group by on store_id , item , qty ) > target
Tip :: aggregator will sort the data in descending order if u dnt use sorted input.
Q12> in the source qualifer if
the default query is not generated... what is the reason...? how to slove it?
Ans :: (i)if source is flat file you cannot use this feature in source
qualifier
(ii)In case if u are using the relational file as source and if u forget make
the connection to the next transformation from source qulaifier .u cannot
gerate SQL query