- A
Keep the schema as is; Cloud SQL supports MyISAM.
Why wrong: Cloud SQL for MySQL does not support MyISAM; it uses InnoDB.
- B
Convert MyISAM tables to InnoDB before migration.
InnoDB is the default and recommended engine; conversion ensures compatibility and transactional support.
- C
Replicate the on-premises MySQL to Cloud SQL using Database Migration Service.
Why wrong: Replication would still encounter the unsupported MyISAM engine; conversion is necessary.
- D
Export the database using mysqldump and import directly into Cloud SQL.
Why wrong: Importing MyISAM tables will fail because MyISAM is not supported.
Question 567 of 1,000
Convert MyISAM to InnoDB for Cloud SQL MySQL Migration
This PCDE practice question tests your understanding of design and implement database schemas. 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.
A team is migrating an on-premises MySQL database to Cloud SQL. The current schema usesMyISAM tables. What is the recommended approach?
Quick Answer
The answer is to convert MyISAM tables to InnoDB before migration. This is correct because Cloud SQL for MySQL does not support the MyISAM storage engine, which lacks critical features like crash recovery, row-level locking, and ACID compliance that InnoDB provides for transactional workloads. On the Google Professional Cloud Database Engineer exam, this question tests your understanding of Cloud SQL’s engine compatibility and the importance of schema preparation during lift-and-shift migrations. A common trap is assuming that a simple mysqldump will work as-is, but the dump will fail if MyISAM tables are present, or worse, silently convert them to an unsupported state. Another pitfall is attempting to change engines post-migration, which risks data integrity. Remember the memory tip: “MyISAM is a museum piece—InnoDB is the engine for the cloud.” Always convert your storage engine before the dump to ensure a smooth, supported migration.
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
✓
Convert MyISAM tables to InnoDB before migration.
Cloud SQL for MySQL does not support MyISAM tables because MyISAM lacks transaction support, row-level locking, and crash recovery, which are essential for a managed database service. Converting MyISAM tables to InnoDB before migration ensures compatibility, data integrity, and performance. The recommended approach is to alter the table engine to InnoDB prior to export or use a migration tool that handles the conversion.
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.
- ✗
Keep the schema as is; Cloud SQL supports MyISAM.
Why it's wrong here
Cloud SQL for MySQL does not support MyISAM; it uses InnoDB.
- ✓
Convert MyISAM tables to InnoDB before migration.
Why this is correct
InnoDB is the default and recommended engine; conversion ensures compatibility and transactional support.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Replicate the on-premises MySQL to Cloud SQL using Database Migration Service.
Why it's wrong here
Replication would still encounter the unsupported MyISAM engine; conversion is necessary.
- ✗
Export the database using mysqldump and import directly into Cloud SQL.
Why it's wrong here
Importing MyISAM tables will fail because MyISAM is not supported.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Cloud SQL supports all MySQL storage engines, but it explicitly restricts to InnoDB and NDB, making MyISAM incompatible without prior conversion.
Detailed technical explanation
How to think about this question
MyISAM uses table-level locking and lacks ACID compliance, making it unsuitable for Cloud SQL's managed environment that relies on InnoDB's row-level locking and crash recovery via redo logs. The conversion can be done with `ALTER TABLE table_name ENGINE=InnoDB;` or by specifying the engine during mysqldump export using the `--compatible=ansi` flag and modifying the dump file. In real-world scenarios, failing to convert MyISAM tables can lead to silent data corruption during replication or import, as Cloud SQL will reject the engine at the storage layer.
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.
TExam Day Tips
- 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.
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FAQ
Questions learners often ask
What does this PCDE question test?
Design and implement database schemas — This question tests Design and implement database schemas — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Convert MyISAM tables to InnoDB before migration. — Cloud SQL for MySQL does not support MyISAM tables because MyISAM lacks transaction support, row-level locking, and crash recovery, which are essential for a managed database service. Converting MyISAM tables to InnoDB before migration ensures compatibility, data integrity, and performance. The recommended approach is to alter the table engine to InnoDB prior to export or use a migration tool that handles the conversion.
What should I do if I get this PCDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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