Data Migration Mock Interview

Master 25 Data Migration interview questions covering ETL processes, risk mitigation, and legacy system transitions.

Question 6 of 25

What operations are executed in a data migration system, and in what order?

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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.

"Regardless of which data migration tool you are using to transfer data from the sources into a data warehouse, the operations performed are similar. The three distinct processes are extracting the data from the source, cleansing or validating it, and then writing it to the target database or data warehouse."

William Swansen

This is another technical question. The nuance of this question is that not only is it asking you to define the steps, but also asks what order in which they are performed. This will ensure that you are knowledgeable about this process and have used it before.

William Swansen

"The typical data migration system consists of three distinct operations. These include extracting the data from the data source, which can be an Oracle, Microsoft, or any other relational database, transforming the data by performing a data cleansing and validation process, and writing the data into the target database or data warehouse."

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25Data Migration Interview Questions & Answers

1.Can you explain the key features of a data migration system within a data warehouse?

2.What are the day-to-day functions a data migration system performs?

3.What are some of the standard data formats in a data migration system?

4.What is the purpose of data profiling in the data migration system?

5.Can you explain what a data migration validator is and how it is used in data migration?

Data Migration Mock Interview

What operations are executed in a data migration system, and in what order?

25Data Migration Interview Questions & Answers

1.Can you explain the key features of a data migration system within a data warehouse?

2.What are the day-to-day functions a data migration system performs?

3.What are some of the standard data formats in a data migration system?

4.What is the purpose of data profiling in the data migration system?

5.Can you explain what a data migration validator is and how it is used in data migration?

6.What operations are executed in a data migration system, and in what order?

7.Can you name some of the popular data migration tools available to database administrators?

8.Can you describe the roles and responsibilities of a data migration team?

9.Why is it important to analyze the impact of changes in a data migration system?

10.What is the best way to process a fixed-length flat file?

11.Why is it important to have real-time data migration into a data warehouse?

12.What is the difference between an initial load and a full load process in the context of data migration?

13.What then is meant by an incremental load?

14.With regard to data migration, what is referred to as a Three-Tier System?

15.Can you tell me the names of the three layers in a data migration system?

16.What is meant by the term "snapshots" as it relates to data migration?

17.What are views, and how do they differ from materialized views?

18.What is a powercenter as it relates to data migration, and what is the difference between a powercenter and a powermart?

19.Can you discuss partitioning in data migration, including the types of partitions and what benefits they bring to data migration?

20.Can you discuss round-robin and hash partitioning in more detail?

21.Can you discuss what is meant by an operational data store and how it works?

22.How are the tables in data migration analyzed, and when does the analysis occur?

23.How do you fine-tune the mapping of the data during data migration?

24.Please define the term workflow and discuss how it is used in the context of data migration?

25.Can you explain the differences between a connected and an unconnected lookup and when you should use each of them in a data migration?