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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q48-Q53):

NEW QUESTION # 48
Which of the following is supported by MongoDB?

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

Answer: D

NEW QUESTION # 49
Which of the following does MongoDB use to provide High Availability and fault tolerance?

A. Replication
B. Indexing
C. Write Concern
D. Sharding

Answer: A

NEW QUESTION # 50
Consider an orders collection that contains these documents:
{ _id: 1, product: " X-pad " , quantity: 950 }
{ _id: 2, product: " X-pad-pro " , quantity: 1000 }
{ _id: 3, product: " X-phone " , quantity: 850 }
{ _id: 4, product: " X-phone-pro " , quantity: 1350 }
Commands A and B are run at the same time. Assume that no other operations are running.

A. findAndModify output shows quantity 850; final quantities for all four documents are 0.
B. findAndModify output shows quantity 0; final X-phone quantity is 1250 while all others are 0.
C. findAndModify output shows quantity 0; final quantities for all four documents are 0.
D. )db.orders.updateMany({}, { $set: { " quantity " : 0 } })What is the possible findAndModify output and database state after these operations complete? Select TWO.
E. )db.orders.findAndModify({query: { " product " : " X-phone " },update: { $set: { " quantity " : 1250 }
}})
F. findAndModify output shows quantity 1250; final X-phone quantity is 1250 while all others are 0.

Answer: A,D

Explanation:
The result depends on how the two concurrent operations interleave at document _id:3. MongoDB guarantees atomicity for each individual document write, but updateMany() is not atomic across the complete set of matching documents. Other operations can run between its per-document modifications. findAndModify also returns the pre-modification version of the selected document by default unless configured to return the updated version. If findAndModify reaches the X-phone first, it observes quantity 850, returns that pre-image, and sets the value to 1250. The concurrent updateMany() can subsequently reach the same document and set it to 0, producing option B. In another valid interleaving, updateMany() first sets the X-phone quantity to 0.
findAndModify then selects that document, returns the pre-image showing 0, and sets the value to 1250.
Because updateMany() has already processed that document, the final value can remain 1250, producing option D. Options A and C do not correctly reflect the default pre-image return behavior together with the possible per-document interleavings. Therefore B and D are both valid outcomes.
Study Guide reference/topic:MongoDB Architecture and Core Operations - single-document atomicity, concurrent writes, findAndModify, and updateMany.

NEW QUESTION # 51
Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

A. db.posts.find({author:"Tom"}.limit({tags:2})
B. db.posts.find({author:"Tom"}.limit($slice:{tags:2})
C. db.posts.find({author:"Tom">,{tags:{$slice:2})
D. Both "db.posts.find({author:"Tom"},{tags:{$slice:2}})" and "db.posts.find({author:"Tom"}).limit($slice: {tags:2})" are valid. $slice works both with projection and limit.

Answer: C

NEW QUESTION # 52
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({comments.author " :-l});
B. db.posts.createIndex({commerits.$.author " :-l});
C. db.posts.createIndex({comments.$.author " : {$desc:l > });

Answer: A

NEW QUESTION # 53
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