CLF-C02 Cloud Technology and Services Practice Question
Which AWS service provides a fully managed NoSQL database designed for single-digit millisecond performance at any scale?
⚠ Common exam trap
Watch out — candidates often confuse Amazon ElastiCache (an in-memory cache) with a NoSQL database, but ElastiCache is not a persistent database and lacks the durability and querying capabilities of DynamoDB.
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 web applications, gaming, and IoT workloads.
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 SQL-based engines like MySQL, PostgreSQL, Oracle, SQL Server, and MariaDB. These engines enforce a fixed schema and ACID transactions, making RDS the wrong choice for a NoSQL workload. DynamoDB, in contrast, offers a flexible schema and key-value/document access patterns, so RDS fails the question's requirement of a NoSQL database.
- ✗
Amazon Redshift
Why it's wrong here
Amazon Redshift is a petabyte-scale, columnar data warehouse optimized for complex analytic queries (OLAP) and business intelligence, not a general-purpose NoSQL database. It stores structured SQL data across nodes in a cluster, and its design prioritizes scan-heavy reporting over low-latency point lookups. This makes Redshift unsuitable for the simple key-value access that DynamoDB handles with single-digit millisecond latency.
- ✓
Amazon DynamoDB
Why this is correct
Amazon DynamoDB is the correct answer because it is a fully managed, serverless NoSQL database that provides consistent single-digit millisecond latency at any scale. It supports both key-value and document data models, with flexible attributes and no schema constraints. DynamoDB automatically scales throughput and storage, replicates across multiple Availability Zones, and integrates natively with AWS Lambda for serverless application patterns.
- ✗
Amazon ElastiCache
Why it's wrong here
Amazon ElastiCache is an in-memory caching service that offers managed Redis or Memcached engines, but it is designed for caching, session storage, or ephemeral data, not as a primary persistent NoSQL database. Although Redis is technically a key-value store, ElastiCache does not guarantee durability of data by default and is not intended to be the system of record. DynamoDB, by contrast, provides durable, highly available storage that survives cache flushes and node failures.
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 |
Go deeper
Related to this question
About these practice questions
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Same concept, more angles
1 more way this is tested on CLF-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which AWS service provides a fully managed NoSQL database with single-digit millisecond latency at any scale?
easy- A.Amazon RDS
- B.Amazon ElastiCache
- C.Amazon Redshift
- ✓ D.Amazon DynamoDB
Why D: 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.
JA
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.