The correct answer is to use conditional writes with a version number attribute to ensure updates are applied only to the latest version. This is necessary because DynamoDB global tables default to last-writer-wins (LWW) conflict resolution, which can silently overwrite newer data with stale updates when two regions write concurrently. However, when using DynamoDBMapper with optimistic locking, the application must explicitly enforce version control by including a conditional expression that checks a version number attribute; if the version in the request doesn’t match the current table version, the write fails, allowing the application to retry with the refreshed data. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how to override LWW behavior in global tables while maintaining data integrity—a common trap is assuming DynamoDB automatically resolves all conflicts, but it only does so via LWW unless you implement conditional writes. Memory tip: think “Version Check = Write Block” — if the version doesn’t match, the conditional write blocks the stale update.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses DynamoDB global tables in two AWS Regions with strong consistency reads. They observe occasional write conflicts that are not being resolved automatically. The application uses DynamoDBMapper with optimistic locking. What should the DevOps engineer do to ensure conflict resolution?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use conditional writes with a version number attribute to ensure updates are applied only to the latest version.
Option D is correct because DynamoDB global tables use last-writer-wins (LWW) for conflict resolution by default, but when using DynamoDBMapper with optimistic locking, the application must implement conditional writes with a version number attribute to ensure updates are applied only to the latest version. This prevents stale updates from overwriting newer data, as the conditional write will fail if the version number in the request does not match the current version in the table, allowing the application to retry with the updated version.
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.
✗
Implement a custom conflict resolution using DynamoDB Streams and AWS Lambda.
Why it's wrong here
Custom resolution adds complexity; global tables already have built-in LWW.
✗
Switch to eventual consistency reads to reduce conflicts.
Why it's wrong here
Eventual consistency does not resolve conflicts; it only relaxes read freshness.
✗
Add a third global table region to increase redundancy.
Why it's wrong here
Adding more regions does not resolve conflicts; it may introduce more.
✓
Use conditional writes with a version number attribute to ensure updates are applied only to the latest version.
Why this is correct
Conditional writes with versioning enable optimistic locking, allowing only the latest version to be updated, which aligns with LWW.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think DynamoDB global tables automatically resolve all conflicts, but they overlook that DynamoDBMapper's optimistic locking requires explicit conditional writes with a version attribute to prevent lost updates in multi-region scenarios.
Detailed technical explanation
How to think about this question
DynamoDB global tables replicate data asynchronously across regions, and when concurrent writes occur to the same item in different regions, the default conflict resolution is last-writer-wins based on the timestamp in the DynamoDB Streams record. However, DynamoDBMapper's optimistic locking uses a version number attribute (e.g., @DynamoDBVersionAttribute) to implement conditional writes, which ensures that an update only succeeds if the version number matches the current value in the table, effectively providing application-level conflict detection and resolution. In a real-world scenario, if two clients read version 1 and both attempt to write version 2, only the first conditional write succeeds, and the second fails, requiring the application to re-read the latest version and retry.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use conditional writes with a version number attribute to ensure updates are applied only to the latest version. — Option D is correct because DynamoDB global tables use last-writer-wins (LWW) for conflict resolution by default, but when using DynamoDBMapper with optimistic locking, the application must implement conditional writes with a version number attribute to ensure updates are applied only to the latest version. This prevents stale updates from overwriting newer data, as the conditional write will fail if the version number in the request does not match the current version in the table, allowing the application to retry with the updated version.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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