Discussion
How many copies of the database schema are typically used in the redesign process?
Answer: C
Correct answer: Three
Three copies are used: the operational schema, which is left untouched; a test copy on which the changes and their SQL are proved; and a copy carrying the proposed new design. Working with fewer means either testing against live data or having nowhere to develop the new structure, and the three-copy arrangement is what allows the change to be rehearsed completely before it is applied.
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