Explain do we need an etl tool? When do we go for the tools in the market?
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How many steps etl contains?
what is the advantage of persistent cache? when it should be used?
Eliminating of duplicate records without using dynamic lookups
how would u estimate the size of Lookup transform data and index cache?
if i have a query as flat file how can we load data to target table
What are the different Lookup methods used in Informatica?
What is cube grouping?
what is the difference between OLTP database and data warehousing database?
Difference between flat files and relational sources?
what is the difference between cardinality and Nullability?
how many steps are there in etl process?
we hava more than 1000 records. i have to select first 5 record, last 5 record and 5 records from middle of the source. how can i do in oracle as well as in informetica??
Teradata 
