The correct answer is that the database connection timed out due to inactivity or network connectivity issues. This error, “MySQL server has gone away,” occurs when the client-side connection to the RDS instance is closed by the server, typically because the wait_timeout or interactive_timeout parameter has been exceeded, or because a network interruption—such as a firewall rule change or a transient VPC issue—drops the TCP connection before the application reuses it. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of how RDS connection management differs from query execution or storage errors; a common trap is confusing this timeout error with a query that is too large (max_allowed_packet) or a disk-full scenario. Remember that the error is about the *connection* being gone, not the query failing mid-execution. Memory tip: “Gone” means the handshake is broken—think of a phone call dropped due to silence, not a bad question.
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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.
Exhibit
Refer to the exhibit.
CloudWatch Logs Error:
```
2025-03-15T10:30:00.000Z [ERROR] 2006: MySQL server has gone away
```
A database specialist sees the above error in the application logs for an Amazon RDS for MySQL DB instance. The application is a web server running on an EC2 instance. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The database connection timed out due to inactivity or network connectivity issues.
Option A is correct. The error 'MySQL server has gone away' typically occurs when the connection to the database is closed, often due to a timeout or network issue. Option B is wrong because it is a connection error, not a query execution error. Option C is wrong because disk space issues cause different errors. Option D is wrong because authentication errors are different.
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 database user password has expired.
Why it's wrong here
Expired passwords cause authentication errors.
✗
A user attempted to execute an invalid SQL query.
Why it's wrong here
Invalid queries produce syntax errors.
✓
The database connection timed out due to inactivity or network connectivity issues.
Why this is correct
Common cause of 'server has gone away'.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The database instance has run out of disk space.
Why it's wrong here
Disk full causes write failures, not connection closure.
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.
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The database connection timed out due to inactivity or network connectivity issues. — Option A is correct. The error 'MySQL server has gone away' typically occurs when the connection to the database is closed, often due to a timeout or network issue. Option B is wrong because it is a connection error, not a query execution error. Option C is wrong because disk space issues cause different errors. Option D is wrong because authentication errors are different.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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