The correct answer is that the policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource. This failure occurs because the CreateDBSnapshot API action in AWS RDS requires explicit IAM permissions on both the source DB instance and the resulting snapshot resource; the attached policy only authorizes the snapshot resource, leaving the DB instance permission missing, which triggers the access denied error. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of resource-level permissions for RDS snapshot operations, a common trap where candidates assume a single action permission suffices. Remember that snapshot creation is a two-resource operation: you must grant rds:CreateDBSnapshot on the DB instance (using its ARN) and on the snapshot (using a wildcard or specific ARN). A useful memory tip is "Instance and Snapshot, both must be caught"—if either resource permission is missing, the API call fails.
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.
Refer to the exhibit. A database specialist is troubleshooting an automation script that fails when trying to create a snapshot of the RDS DB instance 'mydb' using an IAM role with the attached policy. The error message indicates that the user is not authorized to perform the operation. Which statement best explains the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource.
Option C is correct because the CreateDBSnapshot action requires permissions on both the DB instance and the snapshot resource. The policy only grants access to the snapshot resource, not the DB instance. Options A and B are wrong because the actions are allowed. Option D is wrong because the resource is specified correctly.
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.
✗
The resource ARN for the snapshot is incorrect; it should specify the DB instance ID.
Why it's wrong here
Snapshot ARN is correct; the issue is missing permission on the DB instance.
✗
The policy does not allow the rds:DescribeDBInstances action on the snapshot resource.
Why it's wrong here
DescribeDBInstances is not needed for creating snapshots.
✗
The policy does not allow the rds:CreateDBSnapshot action on the specific snapshot name.
Why it's wrong here
The action is allowed on all snapshots.
✓
The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource.
Why this is correct
CreateDBSnapshot requires permission on the DB instance.
Clue confirmation
The clue word "best" in the question point toward this answer.
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: The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource. — Option C is correct because the CreateDBSnapshot action requires permissions on both the DB instance and the snapshot resource. The policy only grants access to the snapshot resource, not the DB instance. Options A and B are wrong because the actions are allowed. Option D is wrong because the resource is specified correctly.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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