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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Indexing and Performance Tuning	- Explain plans and diagnostics - Index types and usage - Query performance optimization
Sharding and Scalability	- Shard keys and distribution strategy - Sharded cluster architecture - Balancing and scaling operations
Security	- Encryption at rest and in transit - Authentication and authorization - Role-based access control (RBAC)
MongoDB CRUD Operations	- Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types
Data Modeling	- Schema design principles - Embedding vs referencing - Relationships in MongoDB
Backup, Restore, and Operations	- Backup strategies and tools - Monitoring and maintenance - Restore procedures
Aggregation Framework	- Aggregation pipeline stages - Aggregation operators - Data transformation and grouping
Replication and High Availability	- Failover and elections - Read/write concerns - Replica set architecture

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Free PDF C100DBA - MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Updated Exam Exercise

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q38-Q43):

NEW QUESTION # 38
What command should a MongoDB database administrator use to find the disk utilization of the order collection?

A. db.serverStatus()
B. db.stats()
C. db.order.stats()
D. db.hostInfo()

Answer: C

Explanation:
db.collection.stats() returns statistics for a specific collection, including storage-related values that help a DBA understand that collection ' s disk footprint. Therefore, for a collection named order, db.order.stats() is the relevant command among the choices. The result can include metrics such as logical data size, allocated storage size, document count, index information, and related collection statistics depending on version and storage engine. Option A, db.stats(), reports database-level statistics aggregated across the database rather than isolating the order collection. db.hostInfo(), option C, reports host and operating-system information rather than collection storage consumption. db.serverStatus(), option D, provides broad server-process runtime metrics such as connections, memory, operation counters, replication/storage-engine information, and other health data, but it is not the collection-specific disk-utilization interface requested here. Administrators can also use dedicated helpers such as collection storage-size or total-size methods when they need a more narrowly defined measurement. For a general collection-level statistics query targeting order, however, db.
order.stats() is the correct answer, making option B correct.
Study Guide reference/topic:Performance Monitoring and Tuning - collection statistics, storage utilization, db.
collection.stats(), and database/server metrics.

NEW QUESTION # 39
What does the following $slice query return using the following command? db.posts.find( {}, { comments: { $slice: [ -10, 5 ] } } )

A. Returns 5 comments, beginning with the first 10 items
B. Returns 5 comments, beginning with the last 10 items
C. Returns 10 comments, beginning with the last
D. Returns 10 comments, beginning with the first

Answer: B

NEW QUESTION # 40
In which of the following scenarios is sharding not the correct option. Select all that apply.

A. The write operations on the collection are very high
B. The write operations on the collection are low
C. The working set in the collection is expected to grow very large in size
D. The collection is a read intensive collection with less working set

Answer: B,D

NEW QUESTION # 41
Which of the following is supported by MongoDB?

A. ACID Transactions
B. Transaction Management
C. Journaling
D. Relationships between Collections (Primary Key Foreign Key)

Answer: C

NEW QUESTION # 42
What mongosh command connects to node-1.cluster1.mycompany.local on port 27017?

A. mongosh " node-1.cluster1.mycompany.local & port=27017 "
B. mongosh --hostname " node-1.cluster1.mycompany.local:27017 "
C. mongosh " node-1.cluster1.mycompany.local:27017 "
D. mongosh --connect " node-1.cluster1.mycompany.local:27017 "

Answer: C

Explanation:
mongosh accepts a MongoDB host address in hostname:port form, so mongosh " node-1.cluster1.mycompany.
local:27017 " is the valid choice among the commands shown. A canonical URI form such as mongosh " mongodb://node-1.cluster1.mycompany.local:27017 " is also valid, and the connection can alternatively be expressed using --host together with --port. Option A uses an unsupported --hostname switch rather than the documented --host option. Option B invents a --connect flag that is not the standard mongosh interface.
Option C constructs an invalid string using an ampersand-style parameter rather than a MongoDB URI or a normal host:port target. Port 27017 is MongoDB ' s default server port, so it could often be omitted if the deployment uses the default, but explicitly including it is valid and removes ambiguity. In authenticated or TLS-enabled environments, the DBA would also supply credentials, authentication database, certificate settings, or a connection string carrying those parameters. For the simple host-and-port requirement in the question, option D is correct.
Study Guide reference/topic:Security, Networking, and Encryption - mongosh connectivity, host/port addressing, and connection options.

NEW QUESTION # 43
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