INTERVIEW QUESTIONS DATA WAREHOUSING ETL DETAILS

Question: What is ETL process ?How many steps ETL contains explain with example?

Answer: ETL is extraction , transforming , loading process , you will extract data from the source and apply the business role on it then you will load it in the target

the steps are :
1-define the source(create the odbc and the connection to the source DB)
2-define the target (create the odbc and the connection to the target DB)
3-create the mapping ( you will apply the business role here by adding transformations , and define how the data flow will go from the source to the target )
4-create the session (its a set of instruction that run the mapping , )
5-create the work flow (instruction that run the session)

ETL is extraction , transforming , loading process , you will extract data from the source and apply the business role on it then you will load it in the target

the steps are :
1-define the source(create the odbc and the connection to the source DB)
2-define the target (create the odbc and the connection to the target DB)
3-create the mapping ( you will apply the business role here by adding transformations , and define how the data flow will go from the source to the target )
4-create the session (its a set of instruction that run the mapping , )
5-create the work flow (instruction that run the session) Source: CoolInterview.com

ETL process is to load transform the data in to the receipient tables(Data warehouse). and ETL Consists three steps Extract, Transform and load. Source: CoolInterview.com

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