Data Migration Mock Interview
Master 25 Data Migration interview questions covering ETL processes, risk mitigation, and legacy system transitions.
Question 25 of 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?
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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.
"Connected and unconnected lookups or similar but slightly different. They both query the tables and provide values as a result of the operation. The difference is that connected lookups are part of the workflow and can be tied to another transformation. Unconnected lookups only provide a single output and cannot be connected to other operations. Both types of lockups can be reused if necessary."
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.
This question asks you to compare two similar but different terms and to discuss when to use them in data migration. This is a typical operational question which starts with a definition and then asks you to describe how you would apply it. As a seasoned data migration operator, you should be able to answer this question easily.
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 two types of lookups are called connected and disconnected. A connected looked up is used for mapping and will return multiple values. It is called connected because it can be tied to another transformation. On the other hand, and unconnected lookup is used when it cannot be connected to another transformation. It returns a single value, but it is reusable."
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