- A
Use conditional writes to ensure consistency
Why wrong: Conditional writes do not address cross-region consistency.
- B
Use DynamoDB global tables with last writer wins (LWW) conflict resolution
LWW provides eventual consistency across regions; strong read in primary region is supported.
- C
Use DynamoDB Streams to replicate writes to secondary regions
Why wrong: Streams do not provide write ordering for strong consistency.
- D
Use DynamoDB transactions across regions
Why wrong: Transactions are not supported across regions.
Question 1,304 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 is deploying a new Amazon DynamoDB table with global tables for a multi-region application. The application requires strongly consistent reads in the primary region and eventual consistency in secondary regions. Which write strategy should they use?
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.
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 DynamoDB global tables with last writer wins (LWW) conflict resolution
DynamoDB global tables use last writer wins (LWW) conflict resolution based on the timestamp in the update, which automatically handles concurrent writes across regions. This strategy satisfies the requirement for strongly consistent reads in the primary region and eventual consistency in secondary regions, as global tables replicate data asynchronously and LWW ensures convergence without additional application logic.
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.
- ✗
Use conditional writes to ensure consistency
Why it's wrong here
Conditional writes do not address cross-region consistency.
- ✓
Use DynamoDB global tables with last writer wins (LWW) conflict resolution
Why this is correct
LWW provides eventual consistency across regions; strong read in primary region is supported.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use DynamoDB Streams to replicate writes to secondary regions
Why it's wrong here
Streams do not provide write ordering for strong consistency.
- ✗
Use DynamoDB transactions across regions
Why it's wrong here
Transactions are not supported across regions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse conditional writes or transactions with cross-region consistency mechanisms, not realizing that DynamoDB global tables inherently use LWW and do not support strongly consistent reads across regions.
Detailed technical explanation
How to think about this question
DynamoDB global tables rely on a physical clock-based timestamp (not logical clocks) for LWW conflict resolution, which can lead to data loss if clocks skew significantly between regions; using AWS NTP or a custom conflict resolution strategy with DynamoDB Streams may be necessary for critical applications. Under the hood, global tables use asynchronous replication with a replication lag typically under one second, but strongly consistent reads in the primary region are served locally, while secondary regions always return eventually consistent reads.
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.
TExam Day Tips
- 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Deployment and Migration — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use DynamoDB global tables with last writer wins (LWW) conflict resolution — DynamoDB global tables use last writer wins (LWW) conflict resolution based on the timestamp in the update, which automatically handles concurrent writes across regions. This strategy satisfies the requirement for strongly consistent reads in the primary region and eventual consistency in secondary regions, as global tables replicate data asynchronously and LWW ensures convergence without additional application logic.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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