- A
The source database is using a public IP address.
Why wrong: Public IP affects connectivity but not dump speed significantly.
- B
The source database has many MyISAM tables.
MyISAM tables require table locks during dump, causing slower performance and potential contention. InnoDB tables with --single-transaction allow non-blocking dumps.
- C
Binary logging is not enabled on the source.
Why wrong: Binary logging is needed for CDC, not for the initial dump phase.
- D
The Cloud SQL instance is using a shared-core machine type.
Why wrong: While shared-core could be slow, DMS uses its own compute for dump; Cloud SQL only receives imported data.
Question 446 of 1,000
PCDOE Migrate Database Solutions Practice Question
This PCDOE practice question tests your understanding of migrate database solutions. 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.
During a MySQL to Cloud SQL migration using Database Migration Service, the full dump phase is taking much longer than expected. The source MySQL database is 500 GB and the Cloud SQL instance is of sufficient size. What is the most likely cause of the slow dump?
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 database has many MyISAM tables.
Without --single-transaction, mysqldump locks tables, causing contention and slow performance. DMS uses mysqldump internally and requires InnoDB tables with --single-transaction for consistent non-blocking dumps.
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 source database is using a public IP address.
Why it's wrong here
Public IP affects connectivity but not dump speed significantly.
- ✓
The source database has many MyISAM tables.
Why this is correct
MyISAM tables require table locks during dump, causing slower performance and potential contention. InnoDB tables with --single-transaction allow non-blocking dumps.
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.
- ✗
Binary logging is not enabled on the source.
Why it's wrong here
Binary logging is needed for CDC, not for the initial dump phase.
- ✗
The Cloud SQL instance is using a shared-core machine type.
Why it's wrong here
While shared-core could be slow, DMS uses its own compute for dump; Cloud SQL only receives imported data.
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
Learn the concepts, then practise the questions
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Migrate Database Solutions practice questions
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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 database has many MyISAM tables. — Without --single-transaction, mysqldump locks tables, causing contention and slow performance. DMS uses mysqldump internally and requires InnoDB tables with --single-transaction for consistent non-blocking dumps.
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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