This DBS-C01 practice question tests your understanding of workload-specific database design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 company is migrating an on-premises MongoDB database to AWS. Which AWS database service is most compatible and requires minimal application changes?
Amazon DynamoDB.
Why wrong: Different API and data model.
Amazon DocumentDB (with MongoDB compatibility).
MongoDB-compatible document database.
Amazon Neptune.
Why wrong: Graph database, not document.
Amazon RDS for MySQL.
Why wrong: Relational, not document.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon DocumentDB (with MongoDB compatibility).
Amazon DocumentDB (with MongoDB compatibility) is the most compatible AWS database service for migrating an on-premises MongoDB database because it is purpose-built to emulate the MongoDB wire protocol and data model, allowing existing MongoDB drivers and tools to connect with minimal or no application code changes. This makes it the ideal choice for a lift-and-shift migration that preserves the document-oriented structure and query patterns of MongoDB.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon DynamoDB.
Why it's wrong here
Different API and data model.
Amazon DocumentDB (with MongoDB compatibility).
Why this is correct
MongoDB-compatible document database.
Related concept
Read the scenario before looking for a memorised answer.
Amazon Neptune.
Why it's wrong here
Graph database, not document.
Amazon RDS for MySQL.
Why it's wrong here
Relational, not document.
Common exam traps
The trap here is that candidates may assume DynamoDB is a suitable document database for MongoDB migration because both are NoSQL, overlooking the critical fact that DynamoDB uses a completely different API and data model, which would require a full application rewrite rather than minimal changes.
Detailed technical explanation
Amazon DocumentDB implements the MongoDB 3.6 and 4.0 wire protocol, meaning it supports CRUD operations, indexes, and aggregation pipelines using the same BSON data format and MongoDB drivers. Under the hood, DocumentDB uses a distributed, fault-tolerant storage architecture with 6 replicas across 3 Availability Zones, automatically replicating data for durability. In real-world scenarios, customers migrating from MongoDB to DocumentDB often encounter subtle differences in behavior, such as the lack of support for certain MongoDB features like change streams or the $lookup aggregation stage with uncorrelated subqueries, which may require minor query adjustments.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon DocumentDB (with MongoDB compatibility). — Amazon DocumentDB (with MongoDB compatibility) is the most compatible AWS database service for migrating an on-premises MongoDB database because it is purpose-built to emulate the MongoDB wire protocol and data model, allowing existing MongoDB drivers and tools to connect with minimal or no application code changes. This makes it the ideal choice for a lift-and-shift migration that preserves the document-oriented structure and query patterns of MongoDB.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DBS-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 DBS-C01 exam.
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