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Troubleshooting and Optimization →hardMultiple SelectObjective-mapped

DVA-C02 Troubleshooting and Optimization Practice Question

This DVA-C02 practice question tests your understanding of troubleshooting and optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer is optimizing an application that uses Amazon DynamoDB. The application reads items by primary key and also performs queries on a Global Secondary Index (GSI). The developer notices that some queries on the GSI are slow. Which TWO actions would improve the performance of GSI queries? (Choose TWO.)

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

Question 1hardmulti select

Full question →

A
Use a more distributed GSI partition key to avoid hot partitions.
A hot partition can cause throttling; a more distributed key spreads read traffic evenly.
B
Ensure that the GSI key attribute exists on all items that need to be queried.
If the GSI is sparse, queries may scan many items; ensuring the attribute is present on all relevant items improves query efficiency.
C
Increase the read capacity of the GSI.
Why wrong: There is no separate read capacity for a GSI; it uses the table's read capacity.
D
Use strongly consistent reads on the GSI.
Why wrong: Strongly consistent reads are more expensive and slower; GSIs only support eventually consistent reads by default.
E
Increase the write capacity of the DynamoDB table.
Why wrong: Write capacity does not affect read performance on GSIs.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Use a more distributed GSI partition key to avoid hot partitions.

Option A and Option B are correct. Option A: If the GSI is sparse (not all items have the GSI key attribute), the index may not have enough data to distribute reads; adding a filter condition can help. Actually, ensuring that the GSI key attribute exists on all items that need to be queried can improve performance. Option B: Overloading the GSI partition key can cause hot partitions; using a more distributed key pattern helps. Option C (adjust write capacity) does not directly help read performance on GSI. Option D (use strong consistency) would actually increase latency. Option E (increase read capacity) could help if the issue is throttling, but the question asks for two actions. Let me reconsider: The correct options should be: B (use a more distributed GSI partition key) and E (increase read capacity on the index) if the issue is throttling. However, increasing read capacity on the index is not directly possible; you increase read capacity on the table, which is shared with GSIs. Actually, GSIs use the same read capacity units as the table. So option E is not accurate. Option C says 'Increase the write capacity of the table' which would not help read performance. Option D 'Use strongly consistent reads' would be slower. So the best two are: B (redistribute keys) and A (ensure GSI key attribute exists on queried items) to avoid sparse index. Let me adjust the correct answers.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Use a more distributed GSI partition key to avoid hot partitions.
Why this is correct
A hot partition can cause throttling; a more distributed key spreads read traffic evenly.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✓
Ensure that the GSI key attribute exists on all items that need to be queried.
Why this is correct
If the GSI is sparse, queries may scan many items; ensuring the attribute is present on all relevant items improves query efficiency.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the read capacity of the GSI.
Why it's wrong here
There is no separate read capacity for a GSI; it uses the table's read capacity.
✗
Use strongly consistent reads on the GSI.
Why it's wrong here
Strongly consistent reads are more expensive and slower; GSIs only support eventually consistent reads by default.
✗
Increase the write capacity of the DynamoDB table.
Why it's wrong here
Write capacity does not affect read performance on GSIs.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DVA-C02 NAT questions on configuration and troubleshooting.

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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Use a more distributed GSI partition key to avoid hot partitions. — Option A and Option B are correct. Option A: If the GSI is sparse (not all items have the GSI key attribute), the index may not have enough data to distribute reads; adding a filter condition can help. Actually, ensuring that the GSI key attribute exists on all items that need to be queried can improve performance. Option B: Overloading the GSI partition key can cause hot partitions; using a more distributed key pattern helps. Option C (adjust write capacity) does not directly help read performance on GSI. Option D (use strong consistency) would actually increase latency. Option E (increase read capacity) could help if the issue is throttling, but the question asks for two actions. Let me reconsider: The correct options should be: B (use a more distributed GSI partition key) and E (increase read capacity on the index) if the issue is throttling. However, increasing read capacity on the index is not directly possible; you increase read capacity on the table, which is shared with GSIs. Actually, GSIs use the same read capacity units as the table. So option E is not accurate. Option C says 'Increase the write capacity of the table' which would not help read performance. Option D 'Use strongly consistent reads' would be slower. So the best two are: B (redistribute keys) and A (ensure GSI key attribute exists on queried items) to avoid sparse index. Let me adjust the correct answers.

What should I do if I get this DVA-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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