Preparing for the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) exam in 2026 does not require a classroom. With ExamCost, your 174 practice questions for the C100DBA exam travel with you — the online engine works on phones, tablets, and computers alike, turning idle minutes into timed mock sessions.
MongoDB C100DBA Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Data Modeling | - Embedding vs referencing - Schema design principles - Relationships in MongoDB |
| Topic 2: Backup, Restore, and Operations | - Monitoring and maintenance - Restore procedures - Backup strategies and tools |
| Topic 3: Security | - Role-based access control (RBAC) - Authentication and authorization - Encryption at rest and in transit |
| Topic 4: Replication and High Availability | - Replica set architecture - Failover and elections - Read/write concerns |
| Topic 5: Aggregation Framework | - Aggregation operators - Aggregation pipeline stages - Data transformation and grouping |
| Topic 6: Indexing and Performance Tuning | - Query performance optimization - Index types and usage - Explain plans and diagnostics |
| Topic 7: MongoDB CRUD Operations | - Working with documents and BSON types - Querying and filtering documents - Insert, update, and delete operations |
| Topic 8: Sharding and Scalability | - Balancing and scaling operations - Shard keys and distribution strategy - Sharded cluster architecture |
Everything to Know About the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Exam
The C100DBA exam is the official assessment for the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification offered by MongoDB. It checks whether you can apply the knowledge areas in the exam objectives to practical situations, and passing it earns a credential that employers across the industry recognize. For professionals who feel stuck in their current role, it is often the most concrete next step available.
Recommended practical experience administering MongoDB deployments (approximately 6+ months) and familiarity with MongoDB 4.4 features.
The official outline for the C100DBA exam highlights these domains:
- Security ()
- Backup, Restore, and Operations ()
- Replication and High Availability ()
Weighting your study time toward the heavier domains first is a sensible strategy, and the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) practice questions at ExamCost follow the same objective structure.
MongoDB recommends the following training resources for C100DBA exam candidates:
Pairing official courses with timed practice sessions tends to work well, since one builds knowledge and the other builds exam-day rhythm.
The online test engine is exclusive to ExamCost and runs on any electronic device — phone, tablet, or computer — with no installation barriers. It recreates the atmosphere of the real C100DBA exam: you set the test time the way it will be on exam day, work through the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) practice questions under that pressure, and at the end the engine marks the questions you got wrong and reminds you to practice them again next time. Over a few sessions, that loop turns weak areas into reliable ones.
Registration for the C100DBA exam is handled through the official channels below:
Once your practice scores look consistent, booking a date gives your preparation a firm deadline to work toward.
Right after payment you get instant access to the C100DBA exam product — 174 practice questions for the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) exam with expert-verified answers — and the download link is also emailed to you automatically, typically within a minute. Your purchase includes 365 days of free updates; our team checks for exam changes daily, and when a new version is released the system sends it straight to your mailbox. A 50% renewal discount applies if you extend updates beyond the first year, and payment by Credit Card is handled through a secure checkout.
MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions:
The MongoDB explain() method does not support which of the following verbosity mode:
- A. executionStats
- B. queryPlanner
- C. customExecutionStats
- D. allPlansExecution
Correct Answer: A 🗳️
In what format does mongodump creates backup files?
- A. XML
- B. SOAP
- C. JSON
- D. BSON
Correct Answer: D 🗳️
Given the following MongoDB documents in the cars collection:
{
" carid " : 1,
" make " : " Toyota " ,
" model " : " Celica " ,
" mileage " : 143121,
" color " : " Red " ,
" year " : 2003,
" features " : [ " Leather Interior " , " 2WD " , " CD Player " ]
},
{
" carid " : 2,
" make " : " Honda " ,
" model " : " Civic " ,
" mileage " : 12000,
" color " : " White " ,
" year " : 2020,
" features " : [ " Cloth Interior " , " Sun Roof " , " XM Radio " ]
},
{
" carid " : 3,
" make " : " Tesla " ,
" model " : " Model S " ,
" mileage " : 5,
" color " : " Silver " ,
" year " : 2022,
" features " : [ " Leather Interior " , " Sun Roof " , " Auto Pilot " ]
}
What documents are returned from running the following $in query?
db.cars.find({ " features " : { $in: [ " Leather Interior " , " 2WD " , " Auto Pilot " ]}})
- A. Documents with carid 1, 2, and 3.
- B. Documents with carid 1 and 2.
- C. Only the document with carid 3.
- D. [{ " carid " : 1, " make " : " Toyota " , " model " : " Celica " , " mileage " : 143121, " color " : " Red " , " year " : 2003, " features " : [ " Leather Interior " , " 2WD " , " CD Player " ] },{ " carid " : 3, " make " : " Tesla " , " model " : " Model S " , " mileage " : 5, " color " : " Silver " , " year " : 2022, " features " : [ " Leather Interior " , " Sun Roof " , " Auto Pilot " ] }]
Correct Answer: D 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
In a replica set with a primary and two secondaries, what should the write concern be set to so only a single node is required to acknowledge a write operation before it is deemed successful?
- A. { writeConcern: " 1 " }
- B. { writeConcern: 1 }
- C. { writeConcern: { w: 1 } }
- D. { writeConcern: { w: " 1 " } }
Correct Answer: C 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
Which TWO commands can be used to check for all active operations on the current node?
- A. db.adminCommand({ " all " : currentOp})
- B. db.currentOp({ " all " : true })
- C. db.adminCommand({ currentOp : true })
- D. db.currentOp({ op : " command " })
- E. db.currentOp(true)
Correct Answer: C,E 🗳️
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