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MLA-C01 Practice Question: A company uses Amazon SageMaker Feature Store to…
A company uses Amazon SageMaker Feature Store to manage features for real-time inference. They need to store customer transaction data that is updated frequently and must be available for low-latency lookups. Which type of Feature Store should be used?
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
✓
Online store only
The online store is designed for low-latency access, making it suitable for real-time inference lookups. The offline store is used for batch processing and analytics, not for low-latency requirements. Therefore, only the online store is needed. Option C is correct. Options A, B, and D are incorrect because A bypasses Feature Store, B includes the unnecessary offline store, and D uses only the offline store which lacks low-latency capability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Neither; use S3 directly
Why it's wrong here
S3 is not designed for low-latency lookups.
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Both online and offline store
Why it's wrong here
The online store alone delivers the low-latency lookups required; adding the offline store duplicates data for historical batch retrieval the scenario never requests. It is tempting because both stores together is the common production pattern, but the question asks specifically which type serves real-time inference.
- ✓
Online store only
Why this is correct
An online store provides low-latency reads for real-time inference, backed by a low-latency store such as Amazon ElastiCache or DynamoDB. Frequent transaction updates are served immediately, satisfying the requirement without the offline store's analytical latency.
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Offline store only
Why it's wrong here
An offline store only persists features to S3 for batch training and historical retrieval; it cannot serve low-latency real-time lookups, which require the online store. It is tempting because the offline store is the correct choice when the requirement is training datasets or batch scoring rather than millisecond inference.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MLA-C01 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 MLA-C01 exam.