Explain about etl data integration software?
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What do you understand by active and passive transformations?
What are snapshots?
can Informatica be used as a cleansing tool? If yes, give examples of transformations that can implement a data cleansing routine.
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how do u set the size of block buffer?
what is HISTOGRAM? how to generate statistics?
what is dynamic insert?
how do u decide whether u need to do aggregations at database level or at Informatica level?
what are the types in error loging?
What is meant by incremental load?
what are the facilities provided by OLAP to analytical users?
what is the meant by Normalization and de-normalization?
Teradata 
