- A
Amazon DAX
Amazon DAX is an in-memory cache specifically designed for DynamoDB reads. It can significantly reduce read latency for frequently accessed items. Because the application can tolerate brief staleness, DAX’s caching behavior is appropriate and does not require a DynamoDB schema change.
- B
Amazon S3 Transfer Acceleration
Why wrong: S3 Transfer Acceleration speeds up uploads/downloads to S3 over the network. It does not accelerate DynamoDB API reads or cache DynamoDB item data.
- C
Amazon EFS
Why wrong: Amazon EFS is a file storage service. It does not provide DynamoDB read caching or the ability to accelerate DynamoDB API operations.
- D
AWS CloudTrail for data plane reads
Why wrong: CloudTrail records API activity for audit and compliance. It does not speed up application reads and cannot serve as a low-latency cache for DynamoDB item responses.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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.
An application repeatedly reads the same DynamoDB items with very low latency requirements. The application can tolerate slightly stale data (for example, within a few seconds). You want to improve read latency without changing the existing DynamoDB table schema. Which service is the best choice?
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 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
Amazon DAX
Amazon DAX (DynamoDB Accelerator) is an in-memory cache that sits between your application and DynamoDB, providing microsecond read latency for frequently accessed items. Since the application can tolerate slightly stale data (within seconds), DAX's default TTL-based caching is ideal because it reduces read pressure on DynamoDB while serving cached results with significantly lower latency than direct DynamoDB reads.
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 DAX
Why this is correct
Amazon DAX is an in-memory cache specifically designed for DynamoDB reads. It can significantly reduce read latency for frequently accessed items. Because the application can tolerate brief staleness, DAX’s caching behavior is appropriate and does not require a DynamoDB schema change.
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 S3 Transfer Acceleration
Why it's wrong here
S3 Transfer Acceleration speeds up uploads/downloads to S3 over the network. It does not accelerate DynamoDB API reads or cache DynamoDB item data.
- ✗
Amazon EFS
Why it's wrong here
Amazon EFS is a file storage service. It does not provide DynamoDB read caching or the ability to accelerate DynamoDB API operations.
- ✗
AWS CloudTrail for data plane reads
Why it's wrong here
CloudTrail records API activity for audit and compliance. It does not speed up application reads and cannot serve as a low-latency cache for DynamoDB item responses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing a caching layer (DAX) with unrelated acceleration or storage services (S3 Transfer Acceleration, EFS) or with auditing tools (CloudTrail), leading candidates to pick options that don't address DynamoDB read latency at all.
Detailed technical explanation
How to think about this question
DAX maintains a write-through cache that synchronously updates on writes and asynchronously refreshes on reads, with a configurable TTL (default 5 minutes) that matches the 'stale within seconds' tolerance. Under the hood, DAX uses a cluster of nodes running Memcached-compatible protocol, automatically handling cache hits at sub-millisecond latency while forwarding misses to DynamoDB with minimal overhead. In real-world scenarios, DAX is commonly used for gaming leaderboards or session stores where read-heavy workloads benefit from caching without requiring strong consistency.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon DAX — Amazon DAX (DynamoDB Accelerator) is an in-memory cache that sits between your application and DynamoDB, providing microsecond read latency for frequently accessed items. Since the application can tolerate slightly stale data (within seconds), DAX's default TTL-based caching is ideal because it reduces read pressure on DynamoDB while serving cached results with significantly lower latency than direct DynamoDB reads.
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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Last reviewed: Jun 11, 2026
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