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Question ID 12756

You are trying to identify a multi-column primary key in a table of 50 million records. What
steps canyou take to minimize performance impact?

Option A

None, you must always assess full volume of data.

Option B

 Use a data sample; apply regression analysis to identify statistically likely candidates; apply duplicate check.

Option C

Use a data sample; limit the test to specific columns at one time; incrementally increase the number of possible column combinations.

Option D

Use a data sample; apply functional dependency analysis to remove dependent columns; incrementally increase the number of possible column combinations.

Correct Answer C
Explanation


Question ID 12757

You are evaluating a Date of Birth field in your customer table. Which of the following
represent three key steps in analyzing this field?

Option A

Ensure no null values; Evaluate skews in frequency; Ensure consistency in format.

Option B

Ensure only binary values; Evaluate skews in frequency; Ensure no special characters.

Option C

Ensure no skews in frequency; Ensure only numeric values; Evaluate as a primary key.

Option D

Ensure all unique values; Evaluate out-of-range in frequency; Ensure consistency in format.

Correct Answer A
Explanation

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