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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Topic 1: Aggregation Framework	- Aggregation pipeline stages - Aggregation operators - Data transformation and grouping
Topic 2: Security	- Encryption at rest and in transit - Role-based access control (RBAC) - Authentication and authorization
Topic 3: Backup, Restore, and Operations	- Backup strategies and tools - Monitoring and maintenance - Restore procedures
Topic 4: Data Modeling	- Relationships in MongoDB - Schema design principles - Embedding vs referencing
Topic 5: Indexing and Performance Tuning	- Index types and usage - Query performance optimization - Explain plans and diagnostics
Topic 6: Sharding and Scalability	- Sharded cluster architecture - Shard keys and distribution strategy - Balancing and scaling operations
Topic 7: Replication and High Availability	- Read/write concerns - Replica set architecture - Failover and elections
Topic 8: MongoDB CRUD Operations	- Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q34-Q39):

NEW QUESTION # 34
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 last 10 items
B. Returns 10 comments, beginning with the last
C. Returns 5 comments, beginning with the first 10 items
D. Returns 10 comments, beginning with the first

Answer: A

NEW QUESTION # 35
'$set' sets the value of

A. Name/value pair
B. Key
C. Code block
D. None of the above

Answer: B

NEW QUESTION # 36
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 # 37
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
B. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: 1 > > >] )
C. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
D. db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )

Answer: C

NEW QUESTION # 38
Which of the following does MongoDB use to provide High Availability and fault tolerance?

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

Answer: A

NEW QUESTION # 39
......

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