Q. Which technique is considered the most inexpensive for data extraction in terms of cost and overhead on source systems?

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Q. In terms of performance impact on source operational systems, which techniques have the least impact?

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Q. Which technique is recommended as the preferred option for dealing with transient source data while minimizing the impact on operational systems?

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

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Q. What is the underlying principle of a data warehouse?

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Q. Why is operational data not directly usable for strategic decision making in a data warehouse?

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Q. What is one of the key challenges in data transformation when moving data to a data warehouse?

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Q. What does data transformation in the context of a data warehouse involve?

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Q. Why is it essential to consider data transformation functions seriously?

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Q. What is the main focus of data transformation in a data warehouse?

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Q. What is the first basic task in data transformation?

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Q. When might you need to perform the selection task during data transformation?

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Q. What is the purpose of the splitting/joining task in data transformation?

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Q. What does the conversion task primarily aim to achieve in data transformation?

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Q. When might summarization be part of the data transformation function?

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Q. What does the enrichment task involve in data transformation?

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Q. Which of the following is a common transformation type that involves changes to the data types and lengths of individual fields?

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Q. What does decoding of fields typically involve in data transformation?

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Q. When is the splitting of single fields necessary in data transformation?

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Q. What is the purpose of merging of information in data transformation?

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