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MongoDB C100DBA Exam Overview:

Certification Vendor:	MongoDB
Exam Name:	MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
Exam Number:	C100DBA
Available Languages:	English
Certificate Validity Period:	3 years
Exam Format:	Multiple Select, Scenario-based, Multiple Choice
Exam Duration:	120 minutes
Related Certifications:	MongoDB Certified Developer Associate MongoDB Certified DBA Professional
Recommended Training:	MongoDB University Learning Platform
Exam Registration:	MongoDB Certification Portal
Sample Questions:	MongoDB C100DBA Sample Questions
Exam Way:	Online proctored exam
Pre Condition:	Recommended practical experience administering MongoDB deployments (approximately 6+ months) and familiarity with MongoDB 4.4 features.
Official Syllabus URL:	https://www.mongodb.com/certification

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Earning the MongoDB C100DBA certification validates your expertise in administering MongoDB databases and can help you advance your career as a database administrator or developer. C100DBA exam is based on MongoDB 4.4, the latest version of the database that introduces several new features and enhancements, including native time series support, distributed transactions, and improved security features. With the knowledge and skills gained through the C100DBA Certification, candidates can become valuable assets to organizations that use MongoDB and contribute to their success.

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q35-Q40):

NEW QUESTION # 35
Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.

A. db.collection.update({b:456>, {$inc: {a:l> })
B. db.collection.find( {a : 232} )
C. db.collection.insert( { a:341})

Answer: A,C

NEW QUESTION # 36
Which of the following collections stores authentication credentials in MongoDB?

A. local.users
B. users.users
C. system.users
D. test.users

Answer: C

NEW QUESTION # 37
What does the following aggregate query perform?

A. Fetches the posts with likes between 100 and 200 and sets their _id as null
B. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
C. Calculates the number of posts with likes between 100 and 200
D. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time

Answer: C

NEW QUESTION # 38
Which of the following is incorrect statement about find and findOne operations in MongoDB?

A. findQ returns all the documents in a collection while findOne() retrieves only the first one.
B. findOneQ returns the actual first document retrieved from a collection
C. find.limit(l) is not the same query as findOne()
D. findQ and findOneQ returns cursors to the collection documents

Answer: D

NEW QUESTION # 39
A MongoDB database administrator needs to improve the performance of the following query:
db.employees.find(
{},
{ name: 1, department: 0, salary: 1 }
).sort({ department: 1, salary: -1 });
What index should the administrator use to achieve this goal?

A. db.employees.createIndex({ salary: 1, name: 1, department: 0 });
B. db.employees.createIndex({ name: 1, department: 1, salary: -1 });
C. db.employees.createIndex({ department: 1, salary: -1 });
D. db.employees.createIndex({ department: 1, salary: 1, name: 1 });

Answer: C

Explanation:
For a compound index to satisfy a multi-field sort, the indexed fields must occur in the same sequence as the sort specification, and their directions must either match the requested pattern or be the complete reverse of it.
The query sorts by { department: 1, salary: -1 }, so option B exactly matches both the key order and the requested directions. MongoDB can scan that index and return the results already ordered, avoiding a blocking in-memory sort. Option A uses { department: 1, salary: 1 }, which does not match the mixed- direction sort and is not its full inverse. Option D puts name before the two sort keys. Because the query has no equality predicate on name, that leading key prevents the later fields from directly providing the requested global sort. Option C is not a sensible index definition for this workload. Separately, the displayed projection mixes inclusion and exclusion (name:1, salary:1, department:0), which MongoDB normally disallows except for _id; that syntax issue should be corrected independently. It does not change the intended index answer for the sort, which is B.
Study Guide reference/topic:Indexing and Query Optimization - compound indexes, sort support, index prefixes, and key direction.

NEW QUESTION # 40
......

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