The answer is to ensure transactions access tables in the same order, reduce transaction duration, and use READ COMMITTED isolation level. These three actions directly address the root causes of deadlocks in Amazon Aurora MySQL: cycle dependencies arise when transactions lock resources in different orders, long-running transactions increase the window for lock contention, and higher isolation levels like REPEATABLE READ add shared locks that escalate into deadlocks during concurrent writes. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of InnoDB locking mechanics and how Aurora’s shared storage layer handles lock escalation; a common trap is mistaking retry logic for prevention, but retries only mask the symptom. Remember the mnemonic “Order, Time, Isolation” — control the order of table access, keep transactions short, and lower isolation to READ COMMITTED to reduce shared locks.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 company uses Amazon Aurora MySQL for its e-commerce platform. The DB cluster has one writer and two readers. Recently, the application started showing occasional deadlock errors during order processing. The error logs show: 'Transaction (Process ID 123) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.' The application retries three times before failing. The development team wants to reduce the likelihood of deadlocks. Which three actions should the team take? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Shorten the duration of transactions by committing frequently.
Options A, C, and D are correct. Option A: Reducing transaction duration minimizes the window for lock conflicts. Option C: Accessing tables in a consistent order avoids cycle dependencies. Option D: Using READ COMMITTED reduces shared locks for reads. Option B is incorrect because increasing retries does not prevent deadlocks; it only delays failure. Option E is incorrect because lowering isolation level to READ UNCOMMITTED can cause dirty reads and is not recommended for e-commerce.
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.
✓
Shorten the duration of transactions by committing frequently.
Why this is correct
Shorter transactions hold locks for less time, reducing the chance of conflicts.
Related concept
Read the scenario before looking for a memorised answer.
✗
Switch to READ UNCOMMITTED isolation level to reduce locking.
Why it's wrong here
READ UNCOMMITTED can cause dirty reads and is not appropriate for e-commerce transactions.
✓
Use READ COMMITTED isolation level instead of REPEATABLE READ.
Read the scenario before looking for a memorised answer.
✗
Increase the number of retry attempts to 10.
Why it's wrong here
Retries do not prevent deadlocks; they only handle failures after they occur.
✓
Ensure that transactions access tables in the same order.
Why this is correct
Consistent access order prevents circular lock dependencies.
Related concept
Read the scenario before looking for a memorised answer.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Shorten the duration of transactions by committing frequently. — Options A, C, and D are correct. Option A: Reducing transaction duration minimizes the window for lock conflicts. Option C: Accessing tables in a consistent order avoids cycle dependencies. Option D: Using READ COMMITTED reduces shared locks for reads. Option B is incorrect because increasing retries does not prevent deadlocks; it only delays failure. Option E is incorrect because lowering isolation level to READ UNCOMMITTED can cause dirty reads and is not recommended for e-commerce.
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.
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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
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