CLF-C02 Cloud Technology and Services Practice Question
Which AWS service provides a fully managed NoSQL database with single-digit millisecond latency at any scale?
⚠ Common exam trap
Candidates often confuse Amazon ElastiCache's low-latency caching with a fully managed NoSQL database, but ElastiCache lacks persistent storage and native query capabilities, making DynamoDB the correct choice for a durable, scalable NoSQL database.
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
Amazon DynamoDB is a fully managed NoSQL key-value and document database that delivers consistent single-digit millisecond latency at any scale. It achieves this through its distributed architecture, automatic partitioning, and SSD-backed storage, making it ideal for high-traffic applications like gaming, ad tech, and IoT.
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 RDS
Why it's wrong here
Amazon RDS is a managed relational database service that supports engines like MySQL, PostgreSQL, Oracle, SQL Server, and MariaDB. It stores data in tables with defined schemas, enforced relationships, and SQL querying, which is the opposite of a NoSQL model. While RDS can handle structured transactional workloads, it is not a NoSQL database and would impose schema rigidity and vertical scaling limits that DynamoDB avoids.
- ✗
Amazon ElastiCache
Why it's wrong here
Amazon ElastiCache is an in-memory caching service that supports Redis and Memcached, designed to accelerate read-heavy workloads by storing frequently accessed data in memory. It is not a durable primary data store; cached data can be lost on node failure unless Redis persistence is configured, and its purpose is to reduce database load, not replace a NoSQL database. ElastiCache may provide low latency like DynamoDB, but it does not offer the same API, data modeling, or durability guarantees as a purpose-built NoSQL database.
- ✗
Amazon Redshift
Why it's wrong here
Amazon Redshift is a cloud data warehouse optimized for online analytical processing (OLAP) of petabyte-scale datasets using SQL. It uses columnar storage, massively parallel processing, and is intended for complex queries over aggregated historical data, not for serving low-latency reads or writes from an application. Redshift is a relational warehouse, not a NoSQL database, and choosing it for a NoSQL workload would introduce unnecessary cost and architectural mismatch.
- ✓
Amazon DynamoDB
Why this is correct
Amazon DynamoDB is a fully managed NoSQL key-value and document database designed for single-digit millisecond latency at any scale. It uses a serverless architecture with automatic partitioning, built-in encryption, and on-demand or provisioned capacity, making it the correct choice for a NoSQL workload. Unlike relational stores, DynamoDB does not require a fixed schema, so items in the same table can have different attributes, which supports flexible, high-velocity application development.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 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 CLF-C02 exam.