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How many steps etl contains?
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What are dimensions?
how do u decide whether u need to do aggregations at database level or at Informatica level?
Explain the use lookup tables and Aggregate tables?
list the transformation used for the following:Heterogeneous sources,Homogeneous sources,Find the 5 highest paid employees with in a dept,create a summery table,generate surrogate keys
How to delete data which is not in source table?
0 Answers IBM, Saama Tech, Wipro,
When do we go for the tools in the market?
Define slowly changing dimensions (SCD)?
Explain about hash partitioning?
how do u decide whether u need to do aggregations at database level or at Informatica level?
WHY CANT WE SEE THE DATA IN DATASET
how do u automate Extraction process?
what are the different Reporting and ETL tools available in the market?
Teradata 
