DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a DynamoDB table that stores order data. The table has a partition key of OrderID and a sort key of OrderDate. The company frequently queries orders by CustomerID, which is not a key attribute. The queries are slow and consume a lot of read capacity. Which design change would MOST improve query performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Global Secondary Index (GSI) with CustomerID as the partition key.
Queries by non-key attributes require a Scan, which is inefficient. Creating a Global Secondary Index with CustomerID as the partition key allows efficient querying. Changing the table's key would break existing applications. Using FilterExpression still scans the table. Increasing read capacity only addresses throttling, not performance of scans.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the provisioned read capacity for the table.
Why it's wrong here
More capacity helps throttling but does not improve scan performance.
✓
Create a Global Secondary Index (GSI) with CustomerID as the partition key.
Why this is correct
GSI allows efficient querying on CustomerID.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the table's primary key to use CustomerID as the partition key.
Why it's wrong here
Changing the key is disruptive and may not be feasible.
✗
Use a FilterExpression on the CustomerID attribute in a Scan operation.
Why it's wrong here
Scan still reads all items; FilterExpression just reduces the returned data.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Global Secondary Index (GSI) with CustomerID as the partition key. — Queries by non-key attributes require a Scan, which is inefficient. Creating a Global Secondary Index with CustomerID as the partition key allows efficient querying. Changing the table's key would break existing applications. Using FilterExpression still scans the table. Increasing read capacity only addresses throttling, not performance of scans.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
Question Discussion
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