Quick Answer
The answer is DynamoDB conditional writes. This feature enables optimistic locking by allowing a write operation to succeed only if a specified condition—such as a version number attribute matching an expected value—evaluates to true, preventing overwrites from concurrent clients. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of how to manage concurrent access without locking resources, often appearing in scenarios involving distributed applications or inventory systems. A common trap is confusing conditional writes with DynamoDB transactions, which provide ACID guarantees but are heavier and not designed for lightweight optimistic concurrency control, or with DynamoDB Streams, which captures changes but does not enforce write conditions. Remember the memory tip: “Check before you write—conditional writes keep the lock light.”
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 wants to deploy a globally distributed application with a DynamoDB table that uses optimistic locking. Which DynamoDB feature should be used to implement this?
DynamoDB Conditional Writes
Conditional writes implement optimistic locking.
DynamoDB Streams
Why wrong: Streams capture changes, not locking.
DynamoDB Global Tables
Why wrong: Global tables replicate data across regions.
DynamoDB Transactions
Why wrong: Transactions are for ACID, not optimistic locking.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
DynamoDB Conditional Writes
DynamoDB conditional writes enable optimistic locking by checking a condition before writing. Option A: Transactions provide ACID but not optimistic locking. Option B: DynamoDB Streams is for change capture. Option D: Global tables provide multi-region replication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
DynamoDB Conditional Writes
Why this is correct
Conditional writes implement optimistic locking.
Related concept
Read the scenario before looking for a memorised answer.
DynamoDB Streams
Why it's wrong here
Streams capture changes, not locking.
DynamoDB Global Tables
Why it's wrong here
Global tables replicate data across regions.
DynamoDB Transactions
Why it's wrong here
Transactions are for ACID, not optimistic locking.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DBS-C01 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.
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
The correct answer is: DynamoDB Conditional Writes — DynamoDB conditional writes enable optimistic locking by checking a condition before writing. Option A: Transactions provide ACID but not optimistic locking. Option B: DynamoDB Streams is for change capture. Option D: Global tables provide multi-region replication.
Identify which DBS-C01 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DBS-C01 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 DBS-C01 exam.
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