The correct strategies to reduce Aurora replication lag are using Aurora Auto Scaling to add read replicas during peak traffic, enabling Binary Log Replication with parallel apply, and using lower isolation levels on replicas. These work because replication lag primarily stems from the replica’s inability to apply changes as fast as the writer generates them—Aurora Auto Scaling distributes the read load across more replicas, parallel apply speeds up binary log replay, and lower isolation levels (like READ COMMITTED) reduce locking contention during apply. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding that the bottleneck is on the replica side, not the writer; a common trap is choosing to upsize the writer instance, which does not directly reduce lag. Remember the mnemonic “Auto, Parallel, Lower” to recall the three correct levers: Auto Scaling, parallel binary log apply, and lower isolation levels.
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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 runs an e-commerce platform on Amazon Aurora MySQL. The platform experiences high traffic during flash sales. To handle the load, they want to offload read traffic to read replicas. However, they are concerned about replication lag causing stale data for inventory checks. Which three strategies can reduce replication lag? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable binary log replication with parallel apply on replicas.
Option A (Use Aurora Auto Scaling) is correct because it adds replicas to distribute load. Option B (Use Binary Log Replication with parallel apply) is correct because it improves replication throughput. Option D (Use lower isolation levels on replicas) is correct because it reduces locking and improves apply speed. Option C is wrong because increasing instance size of replicas helps, but not of the writer; the bottleneck is replica apply. Option E is wrong because synchronous replication would impact write performance.
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.
✓
Enable binary log replication with parallel apply on replicas.
Why this is correct
Parallel apply speeds up replication.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a lower transaction isolation level (e.g., READ COMMITTED) on replicas.
Why this is correct
Lower isolation reduces locking and improves apply speed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement synchronous replication between writer and replicas.
Why it's wrong here
Synchronous replication would slow down writes.
✓
Use Aurora Auto Scaling to add read replicas during peak traffic.
Read the scenario before looking for a memorised answer.
✗
Increase the instance size of the writer instance.
Why it's wrong here
Writer size does not directly reduce replication lag.
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 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.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable binary log replication with parallel apply on replicas. — Option A (Use Aurora Auto Scaling) is correct because it adds replicas to distribute load. Option B (Use Binary Log Replication with parallel apply) is correct because it improves replication throughput. Option D (Use lower isolation levels on replicas) is correct because it reduces locking and improves apply speed. Option C is wrong because increasing instance size of replicas helps, but not of the writer; the bottleneck is replica apply. Option E is wrong because synchronous replication would impact write performance.
What should I do if I get this DBS-C01 question wrong?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.