The answer is Amazon EBS, which is the correct choice because it delivers persistent block storage for EC2 database workloads with low-latency performance, ensuring data survives instance stops or terminations. Unlike ephemeral instance store volumes that lose data on instance lifecycle changes, EBS volumes remain independently attached to a single EC2 instance, making them ideal for databases requiring durable, consistent I/O. On the SAA-C03 exam, this question tests your ability to distinguish between block storage options: a common trap is confusing instance store (fast but ephemeral) with EBS (persistent and detachable). Remember that if the scenario emphasizes data persistence after stop/terminate, EBS is always the answer. A helpful memory tip: EBS stands for Elastic Block Store, and the "B" can remind you that it "B"elongs to the instance but outlives it.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 single EC2 instance hosts a database that needs low-latency block storage and a persistent volume that remains attached to the instance. Which AWS storage service is the best fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EBS
Amazon EBS provides persistent block-level storage volumes that can be attached to a single EC2 instance, offering low-latency performance suitable for database workloads. Unlike ephemeral instance store volumes, EBS volumes persist independently of the instance's lifecycle, ensuring data durability even when the instance is stopped or terminated.
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.
✗
Amazon S3
Why it's wrong here
S3 is object storage and is not designed to act as an attached block device for a database.
✓
Amazon EBS
Why this is correct
EBS provides persistent block storage that can be attached to an EC2 instance with low latency.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon EFS
Why it's wrong here
EFS is a shared file system, which is useful for multiple instances but not as a block volume.
✗
AWS Storage Gateway
Why it's wrong here
Storage Gateway is for hybrid integration with on-premises environments, not a simple EC2 block volume.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Amazon EBS with instance store volumes, where candidates might think instance store is persistent, but EBS is the correct choice for persistent block storage that survives instance stops and terminations.
Detailed technical explanation
How to think about this question
EBS volumes are replicated within an Availability Zone (AZ) for durability and can be provisioned as gp3, io1, or io2 types to meet specific IOPS and throughput requirements. Under the hood, EBS uses a distributed storage system that delivers consistent sub-millisecond latency for most workloads, and volumes can be detached from one instance and reattached to another in the same AZ, though not across AZs without snapshotting. A real-world scenario is running a transactional database like MySQL or PostgreSQL on an EBS-backed EC2 instance, where the volume persists data across instance stops and starts, unlike instance store volumes that are ephemeral.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EBS — Amazon EBS provides persistent block-level storage volumes that can be attached to a single EC2 instance, offering low-latency performance suitable for database workloads. Unlike ephemeral instance store volumes, EBS volumes persist independently of the instance's lifecycle, ensuring data durability even when the instance is stopped or terminated.
What should I do if I get this SAA-C03 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SAA-C03 practice question is part of Courseiva's free Amazon Web Services 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 SAA-C03 exam.
Question Discussion
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