The answer is to take a snapshot of the DB instance, copy it with encryption enabled, and restore the snapshot to a new encrypted DB instance. This is correct because RDS for PostgreSQL does not support enabling encryption at rest on an existing unencrypted database directly; encryption can only be applied at creation time or through a snapshot restore workflow. The process leverages native RDS snapshot copy and restore capabilities, which is the most operationally efficient method as it avoids complex data dumps or additional infrastructure. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of RDS encryption limitations and the snapshot-based workaround—a common trap is assuming you can modify the encryption setting on a running instance. Remember the key constraint: encryption at rest for RDS is a creation-time attribute, not a modification-time one. Memory tip: think “Snapshot, Copy, Restore” as the three-step encryption elevator—you cannot add encryption to an existing floor, you must rebuild the building from an encrypted blueprint.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 stores sensitive user data in an Amazon RDS for PostgreSQL DB instance. A security audit requires that all data be encrypted at rest. The database is currently unencrypted. What is the MOST operationally efficient way to enable encryption at rest?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Take a snapshot of the DB instance, copy it with encryption enabled, and restore the snapshot to a new DB instance.
Option B is correct because RDS for PostgreSQL does not support enabling encryption at rest on an existing unencrypted DB instance directly. The only way to achieve this is by taking a snapshot of the unencrypted instance, creating an encrypted copy of that snapshot, and then restoring it to a new encrypted DB instance. This method is operationally efficient as it uses native RDS snapshot copy and restore capabilities without requiring additional infrastructure or manual data migration.
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.
✗
Create a read replica with encryption enabled and promote it.
Why it's wrong here
The read replica would be encrypted, but the source remains unencrypted, and promoting it doesn't fix the source.
✓
Take a snapshot of the DB instance, copy it with encryption enabled, and restore the snapshot to a new DB instance.
Why this is correct
This is the standard method to enable encryption for an existing unencrypted RDS instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Modify the DB instance and enable encryption in the console.
Why it's wrong here
RDS does not support enabling encryption on an existing instance directly.
✗
Modify the DB parameter group to include encryption parameters and reboot the instance.
Why it's wrong here
Parameter groups do not control storage encryption; they control database engine parameters.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume encryption can be toggled on via a simple 'Modify' operation in the console or CLI, but AWS RDS explicitly requires a snapshot copy and restore for existing unencrypted instances, a detail often overlooked in favor of more familiar modification workflows.
Detailed technical explanation
How to think about this question
When you copy an RDS snapshot with encryption enabled, AWS KMS generates a new encryption key (or uses a customer-managed key) to encrypt the snapshot data at rest. During the restore process, RDS provisions a new DB instance with encrypted storage using the same KMS key, ensuring all data, including automated backups and read replicas created from that instance, are encrypted. This approach is the only supported path for migrating an unencrypted RDS PostgreSQL instance to an encrypted one without downtime, as the original instance remains available until the new encrypted instance is promoted.
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.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Take a snapshot of the DB instance, copy it with encryption enabled, and restore the snapshot to a new DB instance. — Option B is correct because RDS for PostgreSQL does not support enabling encryption at rest on an existing unencrypted DB instance directly. The only way to achieve this is by taking a snapshot of the unencrypted instance, creating an encrypted copy of that snapshot, and then restoring it to a new encrypted DB instance. This method is operationally efficient as it uses native RDS snapshot copy and restore capabilities without requiring additional infrastructure or manual data migration.
What should I do if I get this DEA-C01 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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Question Discussion
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