Data Migration Mock Interview
Master 25 Data Migration interview questions covering ETL processes, risk mitigation, and legacy system transitions.
Question 21 of 25
Can you discuss what is meant by an operational data store and how it works?
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William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
"The operational data store or ODS functions like a cache between the staging area for incoming data and tables within the data warehouse. The ODS provides analyst the opportunity to review the data before is fully accepted into the data warehouse. Like the data warehouse, the ODS generates primary keys, takes care of any errors in the data, and will reject data that it doesn't need or that have been corrupted."
William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
An interviewer will ask you this question to continue to probe your knowledge of data migration and learn how you use this particular technique in managing a data warehouse environment. As the conversation continues, you'll notice links between the questions previously asked and the ones you are being asked currently. Make sure you are consistent in your answers throughout the interview.
William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
"An operational data store or ODS is where the data is depository between the staging area and the data warehouse. The ODS acts as a temporary data warehouse allowing operators to analyze the business data before fully populates the tables in the data warehouse. Data can remain in the ODS anywhere from minutes two weeks, depending on the need for the data and the operational characteristics of the organization."
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