MONGODB-ASSOCIATE-DATA-MODELER: MongoDB Associate Data Modeler
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About the MongoDB Associate Data Modeler Exam
Master the MongoDB Associate Data Modeler certification (C100DM) — workload-driven schema design, embedding vs referencing, one-to-one/one-to-many/many-to-many relationships, the schema design patterns and anti-patterns, schema evolution and versioning, and indexing, CRUD and consistency for the document model.
The complete practice exam for the MongoDB Associate Data Modeler certification (C100DM). Covers identifying and modeling entities (workload analysis, mapping an ER model to documents, the flexible and polymorphic model, the 16 MiB document limit, schema validation), relationships (embed vs reference, reference placement to avoid unbounded arrays, many-to-many via linking collections, $lookup cost, application-enforced referential integrity, duplicate-data trade-offs), schema design patterns (Computed, Approximation, Bucket, Outlier, Subset, Polymorphic, Inheritance, Archive, Single Collection, Document and Schema Versioning, plus the massive-array and bloated-document anti-patterns), schema evolution (no-downtime additive changes, schema versioning, lazy vs full migration, field restructuring), and CRUD, indexing and consistency (single-document atomicity, multi-document transactions, the ESR index rule, TTL and capped collections, transactions vs background jobs) — every question a real-world scenario with full explanations.
Who Should Take This Exam?
The MongoDB Associate Data Modeler certification is designed for application developers, backend engineers, solutions architects, and data engineers who design MongoDB document schemas. It validates practical, hands-on knowledge of modeling entities and relationships, choosing embedding vs referencing for a workload, applying the right schema design pattern, evolving schemas without downtime, and tuning indexes and consistency for the document model — the design skills that keep a MongoDB application fast and maintainable as it grows.
Prerequisites: None (data modeling experience recommended)
Typical study time: 3-5 weeks of focused study
Exam Quick Facts
| Detail | Value |
|---|---|
| Exam Code | MongoDB Associate Data Modeler (C100DM) |
| Title | MongoDB Associate Data Modeler |
| Duration | 75 minutes |
| Questions | 53 |
| Pass Score | ~60% (pass/fail; cut not publicly published) |
| Cost | $150 USD |
| Provider | MongoDB University (online proctored) |
| Validity | 3 years |
| Prerequisites | None (data modeling experience recommended) |
Exam Domains
| # | Domain | Weight |
|---|---|---|
| 1 | Identifying and Modeling Entities | 20% |
| 2 | Relationships | 20% |
| 3 | Schema Design Patterns | 20% |
| 4 | Schema Evolution | 20% |
| 5 | CRUD, Indexing and Consistency | 20% |
Practice all five domains with 250 scenario-based questions, each with full explanations, in the exam simulator below.