Q. What is the significance of planning for aggregate fact tables in the ETL process?

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Q. What is one of the primary reasons for the complexity of data extraction and transformation functions in data warehousing?

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Q. Why might third-party data extraction tools be preferred in data warehousing over in-house programs?

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Q. What is one key factor that differentiates data extraction for data warehousing from data extraction for operational systems?

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Q. What is a crucial aspect of data extraction that impacts data warehousing success?

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Q. Which of the following is not an issue to consider in data extraction for a data warehouse?

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Q. What is the first step in the source identification process for data extraction in a data warehouse?

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Q. Why is source identification a critical process in data extraction for a data warehouse?

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Q. What is a key characteristic of source data in operational systems?

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Q. In a data warehouse, why is preserving the history of changes in source data important?

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Q. How does the nature of source data impact data extraction techniques for a data warehouse?

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Q. What are the two broad categories of data in operational systems that impact data extraction for a data warehouse?

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Q. Which type of data extraction is primarily used for the initial load of a data warehouse?

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Q. What does "data of revisions" or "incremental data capture" involve in the context of data extraction for a data warehouse?

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Q. Which of the following options for immediate data extraction uses transaction logs from DBMSs?

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Q. What is the primary advantage of using transaction logs for data extraction?

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Q. Which data extraction method allows the capture of both before and after images of data changes?

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Q. What is a disadvantage of using capture through database triggers for data extraction?

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Q. Which data extraction method is applicable to all types of source data, including databases, indexed files, and flat files?

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Q. Deferred data extraction techniques differ from immediate extraction techniques in that they:

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