Which AWS NoSQL Database Meets Global OLTP with Least Overhead?
Short answer
C Amazon DynamoDB delivers fully managed, globally available NoSQL OLTP with single-digit millisecond latency and minimal operational overhead.
Question
Key Takeaways
The exam tests matching AWS database services to workload characteristics; the trap is choosing a compatible-engine service like Keyspaces or DocumentDB when the question asks for DynamoDB's global OLTP and minimal-ops profile.
This DEA-C01 question tests which fully managed AWS NoSQL service delivers single-digit millisecond OLTP performance and global high availability with the least operational overhead. The answer is Amazon DynamoDB (C), because its global tables and serverless scaling match every stated requirement.
Common mistake: A frequent mistake is selecting Amazon DocumentDB because it is a managed NoSQL database, but MongoDB compatibility and instance-based clusters add operational overhead and do not match DynamoDB's global table and single-digit millisecond positioning.
Expert Analysis
Why the Answer Is Correct
Amazon DynamoDB is AWS's fully managed NoSQL key-value and document database designed for high-throughput OLTP, with consistent single-digit millisecond latency at virtually any scale. It supports global tables for multi-Region, active-active replication, which directly satisfies "high availability around the world." Because it is serverless/on-demand capable and handles provisioning, patching, replication, and scaling, it meets the "LEAST operational overhead" requirement better than the other managed NoSQL engines. The question's clues — NoSQL, OLTP, single-digit millisecond, global — map to DynamoDB's documented positioning.
Why the Other Options Are Wrong
Amazon Keyspaces is a managed Apache Cassandra-compatible service, but the question does not require Cassandra API compatibility, and migrating customer information to it would typically add more design and operations work than DynamoDB's native global tables and on-demand capacity. Amazon DocumentDB is MongoDB-compatible and aimed at document workloads, but it is not the default exam answer for global single-digit millisecond OLTP with least ops; its global clusters and instance-based scaling can introduce more capacity planning. Amazon Timestream is a time-series database optimized for IoT and operational metrics, not general customer information OLTP. Thus A, B, and D all miss at least one explicit requirement or add unnecessary operational complexity.
Community Comment Notes
JUNGAWS focused on the latency clue, paraphrasing that "single-digit millisecond performance => DynamoDB." tgv agreed that DynamoDB fits high performance, global availability, and minimal operational overhead. GustonMari added that "RDS and DynamoDB = OLTP," which reinforces the OLTP positioning. HunkyBunky was blunt: "No doubt - DynamoDB." Across the visible comments the consensus is unanimous for DynamoDB, and the reasoning aligns with the official AWS service characteristics.
Official Reference
- https://aws.amazon.com/dynamodb/
- https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Introduction.html
These links open the official vendor documentation in a new tab.
Exam Strategy
When a DEA-C01 question repeats latency, OLTP, global availability, and least operational overhead together, map those keywords directly to DynamoDB before considering compatible-engine services. Also watch for clues such as "time-series" or "MongoDB compatibility," which would redirect you to Timestream or DocumentDB.
Frequently Asked Questions
Why is Amazon Keyspaces not the answer if it is also a managed NoSQL database?
Does Amazon DocumentDB provide single-digit millisecond performance?
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 5 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 5
-
JUNGAWS 👍 7 Answered Cprovide single-digit millisecond performance => DynamoDB
-
JUNGAWS 👍 3C provide single-digit millisecond performance => DynamoDB
-
tgv 👍 2 Answered CAmazon DynamoDB is the most appropriate choice given the company's requirements for high performance, global availability, and minimal operational overhead.
-
GustonMari 👍 1Also RDS and DynamoDB = OLTP
-
HunkyBunky 👍 1 Answered CNo doubt - DynamoDB
Reader comments & corrections
No reader corrections yet — spotted an error or have a note? Share it below.
Related Analysis
Practice All DEA-C01 Questions
Access 100 questions with complete answers and detailed explanations.
View Full DEA-C01 Practice Test →