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What is full load & incremental or refresh load?
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List few etl bugs?
without using ETL tool can u prepare a Data warehousing and maintaining?
What are the different Lookup methods used in Informatica?
how do u really know that paging to disk is happening while u are using a lookup transform?
what are business components in Informatica?
what is HISTOGRAM? how to generate statistics?
Explain the difference between etl tool and olap tools?
What is a staging area? What is the purpose of a staging area?
Explain etl mapping sheets?
what happens if the info.server doesn't find the session parameter in the parameter file?
1.Identify and discuss the problems which are occurred during data quality verification for the single-source and multi-source problems. 2.Testing has very important role in DWH. In ETL testing phase, how can we perform the integration testing and regression testing? 3.What are the perquisites of system testing and regression testing in ETL phase?
what is the difference between normal & bulk loading? and which one is recommended ? why?
Teradata 
