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MongoDB C100DBA Exam Syllabus Topics:

Section	Weight	Objectives
MongoDB Architecture and Deployment	20%	- Core concepts, JSON/BSON, data model - Installation and configuration - Storage engines and server management
Replication and High Availability	15%	- Deployment and maintenance of replica sets - Replica set architecture and components - Failover, elections, read/write concern
Sharding and Scalability	10%	- Sharded cluster architecture - Shard keys, chunk management, balancing - Query routing and cluster operations
CRUD Operations and Indexing	20%	- Index types, creation, and management - Create, Read, Update, Delete operations - Query optimization and aggregation
Backup, Recovery and Maintenance	10%	- Restore procedures and disaster recovery - Logical and physical backup methods - Data consistency and integrity checks
Security and Access Control	15%	- Authentication mechanisms - Role-based access control - Encryption, auditing, and security best practices
Monitoring, Performance and Troubleshooting	10%	- Performance tuning and optimization - Monitoring tools and metrics - Diagnostics and resolving common issues

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q30-Q35):

NEW QUESTION # 30
Given the following MongoDB document in the users collection:
{ " userid " : 1, " first " : " John " , " roles " : " Basic " }
Which statement results in this document?
{ " userid " : 1, " first " : " John " , " roles " : " SuperUser " }

A. db.users.replaceOne({ userid: 1 }, { roles: " SuperUser " })
B. db.users.replaceOne({ userid: 1 }, { userid: 1, first: " John " , roles: " SuperUser " })
C. db.users.replaceOne({ userid: 1 }, { first: " John " , roles: " SuperUser " })
D. db.users.replaceOne({ userid: 1 }, { $set: { roles: " SuperUser " } })

Answer: B

Explanation:
replaceOne() replaces the matched document ' s content with the replacement document, except that the immutable _id value is preserved when it is not explicitly changed. Ordinary application fields that are omitted from the replacement disappear. The required final document must retain userid, retain first, and change roles to " SuperUser " . Option B supplies all three fields and therefore produces the requested document structure. Option A omits userid, so that ordinary field would be removed from the replacement.
Option C omits both userid and first, leaving only roles in addition to the preserved _id. Option D incorrectly uses the update operator $set inside a replacement document. $set belongs with update operations such as updateOne() or updateMany(); a replaceOne() replacement must be a replacement document rather than an update-operator document. This distinction is important for DBAs and application developers because accidental use of a partial replacement can delete fields that were intended to remain. If the goal is only to change one field, updateOne({userid:1}, {$set:{roles: " SuperUser " }}) would normally be safer. Given the choices, B is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - replaceOne(), full-document replacement, and update-versus-replacement semantics.

NEW QUESTION # 31
Which of the following node is used during election in a replication cluster?

A. primary
B. secondary
C. arbiter
D. hidden

Answer: C

NEW QUESTION # 32
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

A. db.posts.createIndex({commerits.$.author " :-l});
B. db.posts.createIndex({comments.author " :-l});
C. db.posts.createIndex({comments.$.author " : {$desc:l > });

Answer: B

NEW QUESTION # 33
Which is the default mode in which the explain() command runs?

A. executionStats
B. allPlansExecution
C. customExecutionStats
D. queryPlanner

Answer: D

NEW QUESTION # 34
What command is used to check the value that " logLevel " is set to?

A. db.adminCommand({ getParameter: 1, " logLevel " : 1 })
B. db.runCommand({ getParameter: 1, " logLevel " : 1 })
C. db.getParameter( " logLevel " )
D. db.getParameter({ " logLevel " : 1})

Answer: A

Explanation:
logLevel is a MongoDB server parameter, and server parameters are retrieved through the administrative getParameter database command. The documented and unambiguous mongosh form is db.adminCommand({ getParameter: 1, logLevel: 1 }), which executes the command against the admin database and requests the current value of logLevel. The first numeric value activates the command, while the logLevel field identifies the parameter to return. Options B and C refer to a db.getParameter() helper that is not the documented interface. Option A uses db.runCommand() without explicitly switching to the admin database. Because getParameter is an administrative command, db.adminCommand() is the correct and reliable form among the choices. Administrators use server parameters to inspect and, where supported, tune aspects of mongod or mongos behavior. logLevel controls global diagnostic verbosity, while component-specific verbosity can be managed through the logging configuration. For this question, option D precisely matches the expected administrative syntax. Checking the current value before changing logging settings is also a sound operational practice during troubleshooting.
Study Guide reference/topic:Performance Monitoring and Tuning - runtime server parameters, logging configuration, and getParameter.

NEW QUESTION # 35
......

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