Preparing for a modern certification with paper alone is a choice, not a requirement. TestsDumps brings the C100DEV exam into the electronic age with 253 practice questions for the MongoDB Certified Developer Associate exam — printable when you want paper, digital everywhere else.
MongoDB C100DEV Exam Overview:
| Certification Vendor: | MongoDB |
|---|---|
| Exam Name: | MongoDB Certified Developer Associate Exam |
| Exam Number: | C100DEV |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Exam Price: | $150 USD |
| Exam Format: | Multiple-response, Multiple-choice |
| Passing Score: | 80% |
| Certificate Validity Period: | 2 years |
| Real Exam Qty: | 60 |
| Recommended Training: | MongoDB University: DF100 Developer Fundamentals MongoDB University: DEV400 Developer Extension |
| Exam Registration: | MongoDB University Registration Pearson VUE Registration |
| Sample Questions: |  |
| Exam Way: | Online proctored via MongoDB University or Pearson VUE test center |
| Pre Condition: | No formal prerequisites; recommended: hands-on MongoDB experience, basic database concepts, JavaScript knowledge |
| Official Syllabus URL: | https://learn.mongodb.com/certifications/c100dev |
MongoDB C100DEV Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: MongoDB Fundamentals & Data Modeling | 15% | - Document model & key features - BSON types & data representation - Schema design & data modeling patterns |
| Topic 2: CRUD Operations & Querying | 20% | - Query operators, projections, sorting - Create, Read, Update, Delete operations - MongoDB Query Language (MQL) |
| Topic 3: Replication & High Availability | 15% | - Write concern & read preference - Replica set architecture - Failover & election concepts |
| Topic 4: Aggregation Framework | 20% | - Aggregation pipeline stages - Data transformation & analysis - Expressions & operators |
| Topic 5: Sharding & Security | 15% | - Authentication & authorization - Basic security best practices - Sharding architecture & components |
| Topic 6: Indexing & Query Performance | 15% | - Index types & properties - Query optimization & explain plans - Compound & multikey indexes |
Your C100DEV Exam Questions, Answered Honestly
MongoDB lists these recommended training resources for the MongoDB Certified Developer Associate exam:
Official training plus consistent self-testing is a proven combination — the 253 practice questions from TestsDumps handle the second half.
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The MongoDB Certified Developer Associate exam presents 60 with 90 minutes to complete them. Practicing under the same clock in the TestsDumps Desktop Test Engine makes the real pacing feel routine.
Online proctored via MongoDB University or Pearson VUE test center Registration for the MongoDB Certified Developer Associate exam goes through these official channels:
After booking, the TestsDumps practice questions reach your inbox within 1 minute — preparation can start the same day.
The official MongoDB Certified Developer Associate outline defines 6 domains. The leading three are Aggregation Framework (20%), Replication & High Availability (15%), and Sharding & Security (15%). See the complete list in the topics section above — the 253 practice questions at TestsDumps cover every domain.
The C100DEV exam is a MongoDB certification exam built on the MongoDB Certified Developer Associate syllabus shown above. As information technology keeps reshaping how industries operate, certified skills remain one of the most portable proofs of capability in 2026. TestsDumps prepares you with 253 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.
Passing the MongoDB Certified Developer Associate exam requires 80%, and the registration fee is $150 USD. A retake costs the same amount again — a practical reason to verify your readiness with the TestsDumps engines before booking.
The full MongoDB Certified Developer Associate preparation set at an affordable, small-profits price: 253 practice questions in three formats — a printable, expert-prepared PDF with instant download; 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. A free demo is available anytime, updates are free for 365 days, renewal afterward is 50% off, installations are unlimited, and checkout is McAfee-secured with automatic encryption of your personal information.
No formal prerequisites; recommended: hands-on MongoDB experience, basic database concepts, JavaScript knowledge Policies change over time, so confirm the current rules on the official MongoDB exam page before scheduling.
MongoDB Certified Developer Associate Sample Questions:
What stages will cause a merge on the primary shard for a database?
- A. $lookup
- B. $out
- C. $group
Correct Answer: A,B 🗳️
Explanation: Only visible for TestsDumps members. You can sign-up / login (it's free).
Which of the following documents are valid JSON format? (select 2)
- A. {_id: 1, name: "Riviera Caterer", cuisine: "American"}
- B. {"_id": 1, "name": "Riviera Caterer", "cuisine": "American"}
- C. {"_id": 1, "address": {"street": "Stillwell Avenue", "zipcode": "11224"}}
- D. ["_id": 1, "name": "Riviera Caterer", "cuisine": "American"]
- E. <"_id": 1, "name": "Riviera Caterer", "cuisine": "American">
Correct Answer: B,C 🗳️
Explanation: Only visible for TestsDumps members. You can sign-up / login (it's free).
Select all true statements about elections (replica set).
- A. Not all nodes have equal chances to become the primary node.
- B. Elections can take place anytime while the primary is available.
- C. Setting a node's priority to 0 ensures that a node never becomes primary.
- D. Nodes with a higher priority are more likely to be selected as primary node.
Correct Answer: A,C,D 🗳️
Explanation: Only visible for TestsDumps members. You can sign-up / login (it's free).
Select all true statements regarding to indexes.
- A. Indexes are used to increase the speed of our queries.
- B. The _id field is not automatically indexed in collection.
- C. Indexes reduce the number of documents that MongoDB must parse to satisfy a query.
- D. Indexes can improve write, update, and delete performance.
Correct Answer: A,C 🗳️
Explanation: Only visible for TestsDumps members. You can sign-up / login (it's free).
A collection called players contains documents with the following structure: { _id: 1, user: 'Tom', scores: [ 23, 56, 3, 52, 62 ], bonus: 5 } { _id: 2, user: 'Jane', scores: [ 42, 50, 10 ], bonus: 3 } You have the following query: db.players.aggregate([{ $addFields: { total_score: { $sum: '$scores' }, avg_score: { $avg: '$scores' } } }, { $addFields: { total_score_with_bonus: { $add: ['$total_score', '$bonus'] } } }, { $match: { bonus: { $gt: 4 } } }]) How can you optimize this query?
- A. Moving the $match stage to the beginning of the pipeline. [{ $match: { bonus: { $gt: 4 } } }, { $addFields: { total_score: { $sum: '$scores' }, avg_score: { $avg: '$scores' } } }, { $addFields: { total_score_with_bonus: { $add: ['$total_score', '$bonus'] } } }]
- B. Moving the $match stage to the second stage of this pipeline. [{ $addFields: { total_score: { $sum: '$scores' }, avg_score: { $avg: '$scores' } } }, { $match: { bonus: { $gt: 4 } } }, { $addFields: { total_score_with_bonus: { $add: ['$total_score', '$bonus'] } } }]
- C. This query cannot be optimized.
Correct Answer: A 🗳️
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