- A
Use the gcloud command to update the existing instance to use CMEK by specifying the key.
Why wrong: Cloud SQL does not support updating encryption type on an existing instance; CMEK must be set at creation.
- B
Create a new Cloud SQL instance with CMEK enabled, then export data from the old instance and import into the new one.
This meets the CMEK requirement by creating a new instance, and data migration via export/import ensures minimal data loss and manageable downtime.
- C
Configure Cloud External Key Manager (EKM) and attach it to the existing instance via a patch operation.
Why wrong: EKM also requires creation of a new instance; it cannot be patched onto an existing instance.
- D
Implement client-side encryption in the application using a library like Tink and store the encrypted data in the existing database.
Why wrong: Client-side encryption requires application changes and does not leverage Cloud SQL's built-in CMEK; it also adds complexity and potential performance impact.
Quick Answer
The correct approach is to create a new Cloud SQL instance with CMEK enabled at provisioning time, then export data from the old instance and import it into the new one. This is necessary because Cloud SQL does not support enabling customer-managed encryption keys on an existing instance; CMEK must be specified during instance creation, as the underlying disk encryption is set at that point. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding that Cloud SQL’s encryption model is immutable after provisioning—a common trap is assuming you can simply modify the existing instance’s encryption settings. The export/import method minimizes downtime and avoids data loss by re-encrypting the data under your key during the transfer. Memory tip: “Create new, move data through—CMEK is a birthright, not a retrofit.”
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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 company runs a Cloud SQL for PostgreSQL instance that stores customer data. They must encrypt the database at rest using customer-managed encryption keys (CMEK) to meet regulatory requirements. The instance is currently using Google-managed encryption. What must they do to implement CMEK? The company wants to minimize downtime and avoid data loss.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Create a new Cloud SQL instance with CMEK enabled, then export data from the old instance and import into the new one.
Option B is correct because Cloud SQL does not support enabling CMEK on an existing instance; you must create a new instance with CMEK enabled at provisioning time. Exporting data from the old instance and importing it into the new one ensures the database is re-encrypted under the customer-managed key with minimal downtime and no data loss, as the export/import process preserves the data.
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.
- ✗
Use the gcloud command to update the existing instance to use CMEK by specifying the key.
Why it's wrong here
Cloud SQL does not support updating encryption type on an existing instance; CMEK must be set at creation.
- ✓
Create a new Cloud SQL instance with CMEK enabled, then export data from the old instance and import into the new one.
Why this is correct
This meets the CMEK requirement by creating a new instance, and data migration via export/import ensures minimal data loss and manageable downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure Cloud External Key Manager (EKM) and attach it to the existing instance via a patch operation.
Why it's wrong here
EKM also requires creation of a new instance; it cannot be patched onto an existing instance.
- ✗
Implement client-side encryption in the application using a library like Tink and store the encrypted data in the existing database.
Why it's wrong here
Client-side encryption requires application changes and does not leverage Cloud SQL's built-in CMEK; it also adds complexity and potential performance impact.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that you can update an existing Cloud SQL instance to use CMEK via a gcloud command or API patch, when in reality CMEK must be configured at instance creation time.
Detailed technical explanation
How to think about this question
Cloud SQL for PostgreSQL uses CMEK through Cloud KMS, where the instance's data is encrypted with a CMEK that is wrapped by a Cloud KMS key. The key must be specified in the `--kms-key-name` flag during `gcloud sql instances create`; attempting to alter encryption on an existing instance fails because the underlying storage volume encryption cannot be changed in-place. The export/import approach uses `gcloud sql export sql` and `gcloud sql import sql`, which creates a consistent snapshot of the database, allowing a seamless migration to a new CMEK-protected instance.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Ensuring data protection — study guide chapter
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FAQ
Questions learners often ask
What does this PCSE question test?
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new Cloud SQL instance with CMEK enabled, then export data from the old instance and import into the new one. — Option B is correct because Cloud SQL does not support enabling CMEK on an existing instance; you must create a new instance with CMEK enabled at provisioning time. Exporting data from the old instance and importing it into the new one ensures the database is re-encrypted under the customer-managed key with minimal downtime and no data loss, as the export/import process preserves the data.
What should I do if I get this PCSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 30, 2026
This PCSE 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 PCSE exam.
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