SAA-C03 DAX is an in-memory cache for DynamoDB. 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. A key principle to apply: dAX is an in-memory cache for DynamoDB.. 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 read-heavy document portal repeatedly queries the same product catalogue data from DynamoDB with millisecond latency requirements. Which service can reduce read latency and table load? The design must avoid adding custom operational scripts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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DynamoDB Accelerator (DAX)
DynamoDB Accelerator (DAX) is an in-memory cache for DynamoDB that delivers microsecond read latency, reducing the number of read requests hitting the underlying table. It requires no custom scripts—just a DAX cluster endpoint—and automatically caches frequently accessed items, making it ideal for a read-heavy document portal with millisecond latency requirements.
Key principle: DAX is an in-memory cache for DynamoDB.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Amazon Kinesis Data Firehose
Why it's wrong here
Firehose loads streaming data to destinations; it does not cache DynamoDB reads.
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S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds S3 transfers, not DynamoDB queries.
✓
DynamoDB Accelerator (DAX)
Why this is correct
DAX is an in-memory cache for DynamoDB that reduces read latency for suitable access patterns.
Related concept
DAX is an in-memory cache for DynamoDB.
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AWS Glue Data Catalog
Why it's wrong here
Glue catalog stores metadata for analytics, not application read caching.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse caching services like ElastiCache with DAX, but DAX is purpose-built for DynamoDB and requires no application code changes beyond pointing to a different endpoint, whereas ElastiCache would need custom cache invalidation logic.
Detailed technical explanation
How to think about this question
DAX uses a write-through caching strategy where writes to DynamoDB are also written to the DAX cluster, ensuring cache coherence for frequently accessed items. Under the hood, DAX maintains a distributed in-memory cache across multiple nodes, and it supports both eventual and strong consistency reads, with a default TTL of 5 minutes for cached items. In a real-world scenario, a portal serving product catalog data with thousands of concurrent users would see a dramatic reduction in DynamoDB read capacity units consumed, lowering costs and avoiding throttling.
KKey Concepts to Remember
DAX is an in-memory cache for DynamoDB.
DAX provides microsecond-latency reads for read-heavy workloads.
DAX is fully managed and requires no operational scripts.
DAX reduces read load on the underlying DynamoDB table.
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
DAX is an in-memory cache for DynamoDB.
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.
Review dAX is an in-memory cache for DynamoDB., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design High-Performing Architectures — This question tests Design High-Performing Architectures — DAX is an in-memory cache for DynamoDB..
What is the correct answer to this question?
The correct answer is: DynamoDB Accelerator (DAX) — DynamoDB Accelerator (DAX) is an in-memory cache for DynamoDB that delivers microsecond read latency, reducing the number of read requests hitting the underlying table. It requires no custom scripts—just a DAX cluster endpoint—and automatically caches frequently accessed items, making it ideal for a read-heavy document portal with millisecond latency requirements.
What should I do if I get this SAA-C03 question wrong?
Review dAX is an in-memory cache for DynamoDB., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
DAX is an in-memory cache for DynamoDB.
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Question Discussion
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