8/4/2014 Informatica ETL Interview Questions Solutions

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Informatica ETL Interview Questions Solutions

Informatica-Interview -Questions Aired Consulting 2/19/2010 No Comment

Dataware Housing Informatica Interview Questions and Solutions

Please use the comment sect ion to answer, if you f ind more relevant

answers to these quest ions.

Exp lain wh at is th e d ifferen ce b etween static cach e an d d yn amic cach e in

In fo rmatica?

An s: In dynamic cache, when we try to insert a new row it checks the lookup cache to

see if it exists, if not inserts it into the target as well as the cache but in case of static

cache the new row is written only in the target and not the lookup cache. The lookup

cache remains static and does not change during the session but incase of dynamic

cache the server inserts, updates in the cache during session.

Exp lain h o w can we jo in two tab les with o u t jo in er o r SQL o verrid e?

An s: We can join the tables using lookup tansformation and by making a cartesian

product.

Wh at are p re-sessio n an d p o st-sessio n o p tio n s in In fo rmatica?

An s: These are shell commands that Informatica server performs before running the

session. We should have the sufficient permission and privileges to run these options

in Informatica.

Exp lain h o w d o we co p y map p in g in In fo rmatica?

An s: There are 3 steps to copy mapping are mentioned below:

1.) First, open navigator window

2.) Open the mapping in repository

3.) Click copy

C an yo u tel l me wh at are th e tasks d o n e b y In fo rmatica server?

An s: The most important tasks done by Informatica server are cited below

a.) Managing the sessions

b.) Running the workflows

c.) Tuning performance

d.) Scheduling of sessions and workflows

Wh at d o yo u mean b y map p in g p arameters an d map p in g variab les?

An s: Mapping parameters are parameters which are constant through out the session.

They are specified before running the session. Unlike parameters, variables change

through out the session.

Exp lain wh at is th e d ifferen ce b etween so u rce q u al i fier an d jo in er

tran sfo rmatio n in In fo rmatica?

An s: We require matching keys in source qualifier which we do not require in joiner

transformation.

Exp lain wh y d o we u se p arti tio n in g th e sessio n in In fo rmatica?

An s: Partitioning achieves the session performance by reducing the time period of

reading the source and loading the data into target.

Fo r sessio n p arti tio n wh at are th e n ecessary tasks yo u h ave to d o ?

An s: Configure the session to partition source data. Then proceed on to install the

Informatica server on a machine with multiple CPU running on it.

Ho w man y n u mb er o f sessio n s th at yo u can create in a b atch ?

An s: In a batch we can create any number of sessions we want.

Can you tell me when the Informat ica server marks that a batch is failed?

Ans: If there is one session configured to “run if previous completes” and that previous

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8/4/2014 Informatica ETL Interview Questions Solutions

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session fails.

Wh at is a co mman d th at u sed to ru n a b atch ?

An s: pmcmd is used to start a batch and run a batch

Wh at are th e d ifferen t o p tio n s u sed to co n fig u re th e seq u en tial b atch es?

An s: Two options available are cited below.

Run the session only if previous session completes successfully.

Always runs the session.

Is i t p o ssib le to start a sessio n with in a b atch in d iv id u al ly?

An s : One can start the sessions in this way in the case of sequential batches only. In

case of the concurrent batches it is next to impossible to start.

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