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Database Security →hardMultiple ChoiceObjective-mapped

DBS-C01 Database Security Practice Question

This DBS-C01 practice question tests your understanding of database security. 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 has an Amazon DynamoDB table with global secondary indexes (GSIs) that store personally identifiable information (PII). The security team requires that all PII is encrypted at rest using a customer-managed KMS key. The table already exists and is encrypted with the default AWS managed key. What is the MOST efficient way to change the encryption to a customer-managed key?

A
Create a backup of the table, restore the backup to a new table, and specify the customer-managed key during restoration.
Why wrong: While backup/restore allows specifying a new KMS key on the restored table, this approach is less efficient because it requires creating a full backup first. AWS Glue can copy data directly without an intermediate backup.
B
Use the AWS Management Console to modify the table and select the customer-managed key.
Why wrong: The AWS Management Console cannot change encryption on an existing DynamoDB table; encryption is set only at table creation.
C
Create a new DynamoDB table with the customer-managed key, use AWS Glue to copy the data from the old table to the new table, and then delete the old table.
Correct. Creating a new table with the desired encryption and copying data via AWS Glue is the most efficient method, as it avoids an intermediate backup step.
D
Use the AWS CLI 'update-table' command with the --sse-specification parameter to change the key.
Why wrong: The 'update-table' command with --sse-specification cannot alter encryption on an existing table; encryption is immutable after creation.

Full breakdown with real-world context →

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 DynamoDB table with the customer-managed key, use AWS Glue to copy the data from the old table to the new table, and then delete the old table.

Option C is correct because DynamoDB does not allow changing encryption on an existing table. You must create a new table with the desired customer-managed KMS key, copy the data (e.g., using AWS Glue), and then delete the old table. Option A is incorrect: although you can restore a backup to a new table with a different key, this method requires an additional backup step, making it less efficient than directly copying data via AWS Glue. Option B is incorrect because the AWS Management Console does not support modifying encryption on an existing table. Option D is incorrect because the 'update-table' CLI command cannot change encryption after table creation.

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 backup of the table, restore the backup to a new table, and specify the customer-managed key during restoration.
Why it's wrong here
While backup/restore allows specifying a new KMS key on the restored table, this approach is less efficient because it requires creating a full backup first. AWS Glue can copy data directly without an intermediate backup.
✗
Use the AWS Management Console to modify the table and select the customer-managed key.
Why it's wrong here
The AWS Management Console cannot change encryption on an existing DynamoDB table; encryption is set only at table creation.
✓
Create a new DynamoDB table with the customer-managed key, use AWS Glue to copy the data from the old table to the new table, and then delete the old table.
Why this is correct
Correct. Creating a new table with the desired encryption and copying data via AWS Glue is the most efficient method, as it avoids an intermediate backup step.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the AWS CLI 'update-table' command with the --sse-specification parameter to change the key.
Why it's wrong here
The 'update-table' command with --sse-specification cannot alter encryption on an existing table; encryption is immutable after creation.

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.

Trap categories for this question

Command / output trap
The 'update-table' command with --sse-specification cannot alter encryption on an existing table; encryption is immutable after creation.

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 DBS-C01 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.

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FAQ

Questions learners often ask

What does this DBS-C01 question test?

Database Security — This question tests Database Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Create a new DynamoDB table with the customer-managed key, use AWS Glue to copy the data from the old table to the new table, and then delete the old table. — Option C is correct because DynamoDB does not allow changing encryption on an existing table. You must create a new table with the desired customer-managed KMS key, copy the data (e.g., using AWS Glue), and then delete the old table. Option A is incorrect: although you can restore a backup to a new table with a different key, this method requires an additional backup step, making it less efficient than directly copying data via AWS Glue. Option B is incorrect because the AWS Management Console does not support modifying encryption on an existing table. Option D is incorrect because the 'update-table' CLI command cannot change encryption after table creation.

What should I do if I get this DBS-C01 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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