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Question

When should the file comparison method for data extraction be used?

a.

Always, as it is the most accurate technique.

b.

Only when dealing with legacy data sources.

c.

When minimizing impact on operational systems is not a concern.

d.

As the first choice for capturing data changes.

Posted under Data Warehousing and OLAP

Answer: (b).Only when dealing with legacy data sources. Explanation:The file comparison method for data extraction should be used when dealing with legacy data sources or when other techniques cannot be applied.

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Q. When should the file comparison method for data extraction be used?
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