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MongoDB C100DBA Exam Questions
Exam Name: MongoDB Certified DBA Associate Exam
Exam Code:
C100DBA
Related Certification(s): MongoDB Certified DBA Associate Certification
Certification Provider: MongoDB
Actual Exam Duration: 90 Minutes
Number of C100DBA practice
questions in our database:
132 (updated: Jul. 09, 2026)
Expected C100DBA Exam Topics, as suggested by MongoDB :
- Topic 1: Philosophy and Features: This topic of the C100DBA exam, assesses MongoDB Database Administrators on their understanding of MongoDB's core characteristics, its differences from RDBMS databases, access and administration methods, and the concept of sharding. Mastery here ensures a strong foundational knowledge of MongoDB philosophy.
- Topic 2: CRUD: This topic of the MongoDB Certified DBA Associate exam evaluates administrators on creating, reading, updating, and deleting documents. It measures the ability to handle structured document insertion, updates, upserts, deletions, and query operations. Proficiency in CRUD operations is vital for daily MongoDB database management.
- Topic 3: Indexes: The C100DBA exam tests knowledge of aspiring MongoDB Database Administrators on optimizing query performance through indexing. Administrators must identify appropriate indexes, understand explain plan outputs, and resolve index-related errors. Effective indexing skills enhance MongoDB database efficiency and performance.
- Topic 4: Server Administration: This topic of the MongoDB Certified DBA Associate exam focuses on essential server management tasks. MongoDB Database Administrators must demonstrate proficiency in starting, stopping, and configuring mongod, using mongosh, and managing replica sets. Competence in server administration is crucial for maintaining MongoDB database operations.
- Topic 5: Monitoring: This topic examines the ability to monitor database performance and health. MongoDB Database Administrators should identify alerts, use currentOp, monitor active operations, and manage storage effectively. Strong monitoring skills ensure the MongoDB database runs smoothly and efficiently.
- Topic 6: Security: The topic assesses the ability to secure MongoDB environments. MongoDB Database Administrators attempting the C100DBA exam must understand TLS, authentication, role-based authorization, encryption, and audit logging. Robust security skills protect MongoDB data integrity and ensure compliance with security standards.
- Topic 7: Replication: It evaluates understanding of replication processes. MongoDB Database Administrators should grasp the roles of primary and secondary nodes, read preferences, rs.status, write concern, and elections. Effective replication management ensures high availability and data redundancy.
- Topic 8: Backup and Recovery: This topic of the C100DBA exam, tests the ability to create backups of replica sets. MongoDB Database Administrators need to know backup procedures to safeguard data and ensure recovery in case of failures. Proficiency here is critical for maintaining data continuity and integrity.
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Free MongoDB C100DBA Exam Actual Questions
Note: Premium Questions for C100DBA were last updated On Jul. 09, 2026 (see below)
Question #1
Consider the following document from the products collection:
What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size: ^L^ } } } )
Correct Answer:
B
Question #2
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like "%john%"
Correct Answer:
A
Question #3
The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:
Correct Answer:
A
Question #4
Consider the following document from the products collection:
What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size: ^L^ } } } )
Correct Answer:
B
Question #5
Which of the following are valid json documents? Select all that apply.
Correct Answer:
A, D
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