- A
Use Oracle's ALTER SYSTEM SET ENCRYPTION KEY command to rotate the key.
Why wrong: Direct Oracle commands may not be supported in RDS.
- B
Use the AWS KMS RotateKey operation to rotate the customer master key (CMK) that is used for TDE.
KMS key rotation is the supported method for TDE key rotation.
- C
Create a new encrypted RDS instance and migrate the data.
Why wrong: Overly complex; key rotation can be done without migration.
- D
Modify the DB instance to use a new KMS key.
Why wrong: Modifying the DB instance does not rotate the TDE key.
Question 691 of 1,730
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is using Amazon RDS for Oracle with Transparent Data Encryption (TDE) enabled. They need to rotate the TDE master key. What is the correct procedure?
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
✓
Use the AWS KMS RotateKey operation to rotate the customer master key (CMK) that is used for TDE.
In Amazon RDS for Oracle with TDE, the master key is stored in AWS KMS. To rotate the TDE master key, you can call the AWS KMS RotateKey operation on the customer master key (CMK) used for TDE, or use the Amazon RDS procedure rds.rds_rotate_tde_key. Option B is correct. Option A is incorrect because Oracle's ALTER SYSTEM SET ENCRYPTION KEY command rotates the Oracle-internal master key, not the KMS CMK, and RDS does not support direct Oracle TDE key rotation. Option C is incorrect because full migration is unnecessary. Option D is incorrect because modifying the DB instance to use a new KMS key changes the key, but does not rotate the existing TDE key.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 Oracle's ALTER SYSTEM SET ENCRYPTION KEY command to rotate the key.
Why it's wrong here
Direct Oracle commands may not be supported in RDS.
- ✓
Use the AWS KMS RotateKey operation to rotate the customer master key (CMK) that is used for TDE.
Why this is correct
KMS key rotation is the supported method for TDE key rotation.
Related concept
Standard ACLs match source addresses.
- ✗
Create a new encrypted RDS instance and migrate the data.
Why it's wrong here
Overly complex; key rotation can be done without migration.
- ✗
Modify the DB instance to use a new KMS key.
Why it's wrong here
Modifying the DB instance does not rotate the TDE key.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Direct Oracle commands may not be supported in RDS.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. 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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use the AWS KMS RotateKey operation to rotate the customer master key (CMK) that is used for TDE. — In Amazon RDS for Oracle with TDE, the master key is stored in AWS KMS. To rotate the TDE master key, you can call the AWS KMS RotateKey operation on the customer master key (CMK) used for TDE, or use the Amazon RDS procedure rds.rds_rotate_tde_key. Option B is correct. Option A is incorrect because Oracle's ALTER SYSTEM SET ENCRYPTION KEY command rotates the Oracle-internal master key, not the KMS CMK, and RDS does not support direct Oracle TDE key rotation. Option C is incorrect because full migration is unnecessary. Option D is incorrect because modifying the DB instance to use a new KMS key changes the key, but does not rotate the existing TDE key.
What should I do if I get this DBS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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