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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Which technique is based on date and time stamps to capture source records for extraction?

View solution

Q. What is a limitation of the Capture by Comparing Files technique?

View solution

Q. How does the Capture by Date and Time Stamp technique handle deleted source records?

View solution

Q. Which deferred data extraction technique may be considered a last resort for legacy data sources?

View solution

Q. What is the primary reason for using the static data capture technique when populating a data warehouse initially?

View solution

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

View solution

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

View solution

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

View solution

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

View solution