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What is fact? What are the types of facts?
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what is an ETL or ETT? And what are the different types?
1)Power center server and client on the same machine 2)power center server and client on the different machines What is the basic difference in these two setups and which is recommended ?
What are the differences between sql override and update override?
how many steps are there in etl process?
Give a way in which u can implement a real time scenario where data in a table is changing and u need to look up data from it.How will u configure the look up transform for this purpose?
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What are the etl testing operations includes?
how do u estimate the depth of the session scheduling queue? Where do u set the number of maximum concurrent sessions that Informatica can run at a given time?
What is etl process?
Assume u have a 24CPU machine with 24GB RAM, suggest how u would like to configure Informatica ,like number of concurrent sessions, RAM requirements etc,max partitions that u would permit per mapping.
how do u decide whether u need to do aggregations at database level or at Informatica level?
hoe to access second value in mapping parameter if it is having more than one value ?????????????
Teradata 
