Exam Name: MongoDB Certified Developer Associate Exam
Certification Provider: MongoDB
Corresponding Certification: MongoDB Certified Developer Associate
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- Total Questions: 253
- Updated on: Oct 21, 2026
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- Total Questions: 253
- Updated on: Oct 21, 2026
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- Total Questions: 253
- Updated on: Oct 21, 2026
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In 2026, keeping abreast of the times means studying on whatever device the moment offers. Actual4dump covers them all for the MongoDB Certified Developer Associate exam: 253 practice questions on paper, on Windows, and in any browser.
MongoDB C100DEV Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Sharding & Security | 15% | - Basic security best practices - Sharding architecture & components - Authentication & authorization |
| Topic 2: Aggregation Framework | 20% | - Aggregation pipeline stages - Data transformation & analysis - Expressions & operators |
| Topic 3: Replication & High Availability | 15% | - Write concern & read preference - Replica set architecture - Failover & election concepts |
| Topic 4: Indexing & Query Performance | 15% | - Query optimization & explain plans - Index types & properties - Compound & multikey indexes |
| Topic 5: CRUD Operations & Querying | 20% | - MongoDB Query Language (MQL) - Create, Read, Update, Delete operations - Query operators, projections, sorting |
| Topic 6: MongoDB Fundamentals & Data Modeling | 15% | - BSON types & data representation - Schema design & data modeling patterns - Document model & key features |
MongoDB Certified Developer Associate Exam: Common Questions
MongoDB recommends these training resources for the MongoDB Certified Developer Associate exam:
Follow the training with steady self-testing — the 253 practice questions from Actual4dump help you apply theory and fill any gaps the training leaves.
The MongoDB Certified Developer Associate exam contains 60 to complete within 90 minutes. Timed simulation in the Actual4dump Desktop Test Engine teaches that rhythm before exam day does.
The official MongoDB Certified Developer Associate outline defines 6 domains. The leading three are Sharding & Security (15%), CRUD Operations & Querying (20%), and MongoDB Fundamentals & Data Modeling (15%). The full list is in the topics section above, and Actual4dump's 253 practice questions cover each one.
The C100DEV exam is a MongoDB certification exam validating the MongoDB Certified Developer Associate syllabus shown above. Earning the credential in 2026 can strengthen a career, and Actual4dump prepares candidates with 253 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.
Online proctored via MongoDB University or Pearson VUE test center Register for the MongoDB Certified Developer Associate exam through these official channels:
After booking, Actual4dump delivers your practice questions within 1 minute — preparation starts the same day.
The MongoDB Certified Developer Associate exam requires 80% to pass, and registration costs $150 USD. A failed attempt means paying the same fee again — a readiness check with the Actual4dump engines before booking is the cheaper option.
Three versions of the same study materials: a printable, expert-prepared PDF with free demo download and instant access; a Desktop Test Engine for Windows that simulates the real exam with two practice modes and works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. Download the demo first, experience the materials, and choose the format you like best — all 253 practice questions are identical across versions. Every purchase includes 365 days of free updates, a 50% renewal discount afterward, and unlimited computer installations.
Actual4dump issues a full refund if you take the MongoDB Certified Developer Associate exam within 60 days of purchase and do not pass. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Alternatively, exchange for two free exam products of equal value and keep your original update service. Orders arrive by email within 1 minute — contact support if nothing arrives within 2 hours.
No formal prerequisites; recommended: hands-on MongoDB experience, basic database concepts, JavaScript knowledge Since requirements change over time, confirm the latest on the official MongoDB exam page before scheduling.
MongoDB Certified Developer Associate Sample Questions:
Select all true statements about the $facet stage.
- A. The $facet stage processes multiple aggregation pipelines within a single stage on the same set of input documents.
- B. The output of the $facet stage is subject to the 16 MB document size limit. If the results of the $facet stage exceed this limit, the aggregation produces an error.
- C. The output of the $facet stage is subject to the 32 MB document size limit. If the results of the $facet stage exceed this limit, the aggregation produces an error.
Correct Answer: A,B 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
MongoDB can benefit from adding more RAM to your servers.
- A. Yes
- B. No
Correct Answer: A 🗳️
Data modeling. You are considering the use of nesting or references in your data model. Your data may change frequently. Which option would be more appropriate?
- A. Use of reference.
- B. Use of nesting.
Correct Answer: A 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
What do you mean by collection scan during query execution?
- A. It can use the index to limit the number of documents it must check.
- B. It scans every document in a collection, to select those documents that match the query.
Correct Answer: B 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
You have the following replica set configuration: conf = { "_id": "replset", "version": 1, "protocolVersion": 1, "members": [ { "_id": 0, "host": "192.168.120.24:27017", "priority": 2, "votes": 1 }, { "_id": 1, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 }, { "_id": 1, "host": "192.168.120.24:27019", "priority": 1, "votes": 1 } ] } Select all true statements about this configuration.
- A. This configuration is incorrect. Host information must be unique for each member in a replica set.
- B. This configuration is incorrect. _id field must be unique for each member in a replica set.
- C. This configuration is incorrect. You can only specify a priority of 0 or 1.
- D. This configuration is correct.
Correct Answer: B 🗳️
Explanation: Only visible for Actual4dump members. You can sign-up / login (it's free).
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