Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A developer is creating a new DynamoDB table to store order data. The orders have a unique order ID and are retrieved by order ID. Occasionally, the developer needs to query orders by customer ID. Which design approach would minimize costs and provide the fastest queries?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Use the order ID as the partition key and create a global secondary index on customer ID
This provides fast queries by order ID (primary) and by customer ID via GSI, minimizing cost and performance impact.
B
Distractor review
Use the customer ID as the partition key and order ID as the sort key
This would require knowing the customer ID to retrieve orders by order ID, making those queries inefficient.
C
Distractor review
Use the order ID as the partition key and scan the table for customer ID queries
Scanning is expensive and slow, not suitable even for occasional queries.
D
Distractor review
Use the customer ID as the partition key and create a local secondary index on order ID
LSI still requires the same partition key (customer ID) to query, so order ID queries would require a scan.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Related practice questions
Related DVA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Use the order ID as the partition key and create a global secondary index on customer ID — Using order ID as the partition key makes primary lookups efficient. A global secondary index on customer ID allows efficient queries by customer ID without scanning, and incurs read/write capacity only when used. Other options are inefficient or costly.
What should I do if I get this DVA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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