Quick Answer
Amazon DocumentDB is the correct choice because it is a fully managed, MongoDB-compatible database service that natively supports MongoDB-specific features like aggregation pipelines, indexes, and queries, allowing you to migrate MongoDB to DocumentDB AWS with minimal application changes. This service eliminates operational overhead by automating hardware provisioning, patching, backups, and replication, directly addressing the need to move an on-premises MongoDB workload to AWS without managing infrastructure. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of when to choose a managed NoSQL service over self-managed options like EC2-hosted MongoDB; a common trap is selecting DynamoDB due to its NoSQL label, but DynamoDB lacks MongoDB wire protocol compatibility and aggregation pipeline support. Remember the memory tip: “DocumentDB is the Document drop-in for MongoDB,” meaning if your app uses MongoDB-specific features, DocumentDB is the direct, managed replacement.
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 running a MongoDB workload on-premises and wants to migrate to AWS with minimal operational overhead. The application uses MongoDB-specific features like aggregation pipelines. Which service is best?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Amazon DynamoDB
Why wrong: DynamoDB is not compatible with MongoDB APIs.
Amazon DocumentDB
DocumentDB is MongoDB-compatible and fully managed, reducing operational overhead.
Amazon RDS for PostgreSQL
Why wrong: RDS for PostgreSQL is relational and does not support MongoDB features.
Amazon Elasticsearch Service
Why wrong: Elasticsearch is a search engine, not a document database.
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
Amazon DocumentDB is the correct choice because it is a fully managed, MongoDB-compatible document database that supports MongoDB-specific features like aggregation pipelines, indexes, and queries. It minimizes operational overhead by handling hardware provisioning, patching, backups, and replication, making it ideal for migrating an on-premises MongoDB workload to AWS without significant application changes.
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
DynamoDB is not compatible with MongoDB APIs.
Amazon DocumentDB
Why this is correct
DocumentDB is MongoDB-compatible and fully managed, reducing operational overhead.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Amazon RDS for PostgreSQL
Why it's wrong here
RDS for PostgreSQL is relational and does not support MongoDB features.
Amazon Elasticsearch Service
Why it's wrong here
Elasticsearch is a search engine, not a document database.
Common exam traps
The trap here is that candidates often choose Amazon DynamoDB because it is a NoSQL database, but they overlook that DynamoDB lacks MongoDB wire protocol compatibility and aggregation pipeline support, forcing a complete application rewrite.
Detailed technical explanation
Amazon DocumentDB implements the MongoDB 4.0 wire protocol, allowing existing MongoDB drivers and tools to connect with minimal changes, but it does not support all MongoDB features (e.g., change streams, some aggregation stages like $lookup with multiple conditions). Under the hood, DocumentDB uses a distributed storage architecture with 6 copies of data across 3 Availability Zones, providing high durability and automatic failover. In real-world scenarios, workloads heavily relying on MongoDB's $graphLookup or $facet may require testing for compatibility, as DocumentDB's implementation can differ in performance or behavior.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Workload-Specific Database Design — study guide chapter
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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 — Amazon DocumentDB is the correct choice because it is a fully managed, MongoDB-compatible document database that supports MongoDB-specific features like aggregation pipelines, indexes, and queries. It minimizes operational overhead by handling hardware provisioning, patching, backups, and replication, making it ideal for migrating an on-premises MongoDB workload to AWS without significant application changes.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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