- A
Cloud SQL Auth Proxy is not configured on the source.
Why wrong: Cloud SQL Auth Proxy is for connecting to Cloud SQL, not for source MySQL.
- B
The Cloud SQL instance does not have binary logging enabled.
Why wrong: Cloud SQL is the target; binary logging is not required on the target for DMS.
- C
The DMS migration job uses the wrong source connection profile.
Why wrong: A wrong connection profile would cause failure earlier, not specifically a missing binlog error.
- D
The source MySQL binary logs have been purged before DMS could replicate them.
If source binary logs are purged (e.g., due to low retention), DMS cannot find them and CDC fails.
Question 211 of 1,000
PCDOE Migrate Database Solutions Practice Question
This PCDOE practice question tests your understanding of migrate database solutions. 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 is migrating their on-premises MySQL database to Cloud SQL using Database Migration Service (DMS). The source database is MySQL 5.7, and the target is a Cloud SQL MySQL 8.0 instance. The migration job is set to continuous, but after the full dump phase, the CDC phase keeps failing with the error 'binary log not found'. 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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The source MySQL binary logs have been purged before DMS could replicate them.
DMS continuous migration requires binary logging enabled on the source with row-based format, and the binary log files must be retained until they are consumed. If the source binary logs are purged before DMS reads them, CDC fails.
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.
- ✗
Cloud SQL Auth Proxy is not configured on the source.
Why it's wrong here
Cloud SQL Auth Proxy is for connecting to Cloud SQL, not for source MySQL.
- ✗
The Cloud SQL instance does not have binary logging enabled.
Why it's wrong here
Cloud SQL is the target; binary logging is not required on the target for DMS.
- ✗
The DMS migration job uses the wrong source connection profile.
Why it's wrong here
A wrong connection profile would cause failure earlier, not specifically a missing binlog error.
- ✓
The source MySQL binary logs have been purged before DMS could replicate them.
Why this is correct
If source binary logs are purged (e.g., due to low retention), DMS cannot find them and CDC fails.
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.
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 PCDOE 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.
- →
Migrate Database Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this PCDOE question test?
Migrate Database Solutions — This question tests Migrate Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The source MySQL binary logs have been purged before DMS could replicate them. — DMS continuous migration requires binary logging enabled on the source with row-based format, and the binary log files must be retained until they are consumed. If the source binary logs are purged before DMS reads them, CDC fails.
What should I do if I get this PCDOE question wrong?
Identify which PCDOE 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.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDOE practice question is part of Courseiva's free Google Cloud 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 PCDOE exam.
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