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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Server Administration	- Database Operations 1. Backup and Restore 2. Storage Management 3. Configuration Management 4. Monitoring
Sharding	- Cluster Scaling 1. Balancer Operations 2. Chunk Distribution 3. Shard Keys 4. Query Routing
CRUD Operations	- Data Manipulation 1. Update Operations 2. Delete Operations 3. Read Queries 4. Insert Operations
Philosophy and Features	- MongoDB Architecture 1. Document Model 2. Scalability Concepts 3. High Availability Concepts 4. Collections and Databases
Replication	- Replica Sets 1. Elections 2. Primary and Secondary Nodes 3. Read Preferences 4. Write Concerns
Application Administration	- Security and Access Control 1. User Management 2. Role-Based Access Control 3. Authentication 4. Authorization
Indexes	- Index Management 1. Index Selection 2. Query Performance Optimization 3. Compound Indexes 4. Single Field Indexes

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

NEW QUESTION # 30
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )

A. {". Jd" : : 5, "a" : 3, "c" : : 0, "b" : 12}
B. {". Jd" : : 4, "a" : 5, "c" : : 0, "b" : 17}
C. { \ Jd" : 10,"a" : 3, "c" : 1, "b" : 1}
D. {". Jd" : : 8, "a" : 11, "c" : 1, "b" : 0}
E. { ''\ Jd" : 9, "a" : 17, "c" : 1, "b" : 1}
F. {''_ Jd" : 7, "a" : 8, "c" : 1, "b" : 7}
G. {". Jd" : : 2, "a" : 2, "c" : : 0, "b" : 1}
H. {". Jd" : : 1, "a" : 0, "c" : : 0, "b" : 2}
I. {''_ _id" : 3, "a" : 4, "c" : 0, "b" : 14}
J. {". Jd" : 6, "a" : 1, "c" : 1, "b" : 5}

Answer: A,C,D,E,G

NEW QUESTION # 31
What is the output of following two commands in MongoDB: db. posts. insert({n_id " :l}) db.posts.insert({ "
_id " :l})

A. It will insert two documents and throw a warning to the user
B. This will throw a duplicate key error
C. MongoDB will automatically increment the _id of the second document as 2
D. Two documents will be inserted with _id as 1

Answer: B

NEW QUESTION # 32
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: " $pop " } }
}] )
C. db.population.aggregate( [{ $group: { _id: { state: Estate " , city: " $city " },pop: { $sum: 1 > > > ] )
D. db.population.aggregate( [{ $group: { _id: { state: " $state " , city: " $city " },pop: { $pop: 1 } } }] )

Answer: B

NEW QUESTION # 33
Which of the following operators is used to updated a document partially?

A. $modify
B. $update
C. $set
D. $project

Answer: C

NEW QUESTION # 34
Which are the ONLY ways to project portions of an array?

A. $
B. All of the above
C. $ elemMatch
D. $slice

Answer: B

NEW QUESTION # 35
......

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