Question 1mediummulti select
Read the full NAT/PAT explanation →Question 32 of 1,040
Quick Answer
The correct answer includes Amazon DynamoDB, DynamoDB Accelerator (DAX), and Amazon ElastiCache for Redis with cluster mode enabled, as this combination delivers the sub-millisecond read latency required for a high performance key value database under extreme traffic spikes. DynamoDB provides single-digit millisecond latency at scale, while DAX acts as an in-memory cache that reduces reads to microseconds, and ElastiCache for Redis offloads additional read pressure during flash sales. On the SAA-C03 exam, this scenario tests your understanding of layered caching strategies for key-value workloads, where a common trap is to select only DynamoDB without DAX or Redis, missing the sub-millisecond requirement. Remember that DynamoDB alone is fast but not sub-millisecond; you need an in-memory layer to achieve that. Memory tip: "DDR" — DynamoDB, DAX, Redis — the three layers for lightning-fast reads.
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.
A company is designing a high-performance database architecture for an e-commerce platform that experiences rapid spikes in read traffic during flash sales. The database must handle millions of reads per second with sub-millisecond latency. The data is key-value in nature, with a small number of attributes per item. Which three options should be included in the architecture? (Choose three.)
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 DynamoDB as the primary database.
Amazon DynamoDB is a fully managed NoSQL key-value database that delivers single-digit millisecond latency at any scale, making it ideal for high-traffic e-commerce platforms with key-value data. DynamoDB Accelerator (DAX) is an in-memory cache that sits in front of DynamoDB, reducing read latency to microseconds for millions of reads per second. Amazon ElastiCache for Redis with cluster mode enabled provides a distributed in-memory cache that can offload read traffic from the primary database, further reducing latency and handling spikes during flash sales.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon RDS with Read Replicas for read scaling, but they fail to recognize that relational databases cannot achieve sub-millisecond latency for millions of reads per second, and that DynamoDB with caching layers is the correct high-performance key-value solution.
Detailed technical explanation
How to think about this question
DynamoDB uses SSD-backed storage and automatic partitioning to distribute data across multiple partitions, enabling consistent low-latency access. DAX acts as a write-through cache that intercepts read requests and serves them from memory, using a microsecond-scale response time, while ElastiCache for Redis with cluster mode shards data across multiple nodes to scale horizontally and handle high concurrency. In a flash sale scenario, combining DynamoDB with DAX and ElastiCache allows the system to absorb read spikes by caching hot keys, while DynamoDB handles writes and cache misses with consistent performance.
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.
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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 DynamoDB as the primary database. — Amazon DynamoDB is a fully managed NoSQL key-value database that delivers single-digit millisecond latency at any scale, making it ideal for high-traffic e-commerce platforms with key-value data. DynamoDB Accelerator (DAX) is an in-memory cache that sits in front of DynamoDB, reducing read latency to microseconds for millions of reads per second. Amazon ElastiCache for Redis with cluster mode enabled provides a distributed in-memory cache that can offload read traffic from the primary database, further reducing latency and handling spikes during flash sales.
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.
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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