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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Topic 1: Philosophy and Features	- MongoDB Architecture 1. Collections and Databases 2. Document Model 3. Scalability Concepts 4. High Availability Concepts
Topic 2: Replication	- Replica Sets 1. Elections 2. Primary and Secondary Nodes 3. Read Preferences 4. Write Concerns
Topic 3: CRUD Operations	- Data Manipulation 1. Read Queries 2. Update Operations 3. Delete Operations 4. Insert Operations
Topic 4: Indexes	- Index Management 1. Index Selection 2. Single Field Indexes 3. Compound Indexes 4. Query Performance Optimization
Topic 5: Sharding	- Cluster Scaling 1. Balancer Operations 2. Chunk Distribution 3. Shard Keys 4. Query Routing
Topic 6: Application Administration	- Security and Access Control 1. User Management 2. Authentication 3. Authorization 4. Role-Based Access Control
Topic 7: Server Administration	- Database Operations 1. Configuration Management 2. Backup and Restore 3. Storage Management 4. Monitoring

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q23-Q28):

NEW QUESTION # 23
In a sharded cluster, from which node does one stop the balancer process before initiating backup?

A. config server node
B. replicaset primary node
C. mongos node
D. Any node

Answer: C

NEW QUESTION # 24
Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc.
Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

A. db.posts.finOne({},{_id:0, post_text:1})
B. db.posts.finOne({},{post_text:1})
C. db.posts.find({},{_id:Of post_text:1})
D. db.posts.findOne({post_text: 1})

Answer: A

NEW QUESTION # 25
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" : 10,"a" : 3, "c" : 1, "b" : 1}
B. {". Jd" : : 5, "a" : 3, "c" : : 0, "b" : 12}
C. {". Jd" : : 8, "a" : 11, "c" : 1, "b" : 0}
D. {". Jd" : 6, "a" : 1, "c" : 1, "b" : 5}
E. {''_ _id" : 3, "a" : 4, "c" : 0, "b" : 14}
F. {''_ Jd" : 7, "a" : 8, "c" : 1, "b" : 7}
G. {". Jd" : : 1, "a" : 0, "c" : : 0, "b" : 2}
H. {". Jd" : : 4, "a" : 5, "c" : : 0, "b" : 17}
I. {". Jd" : : 2, "a" : 2, "c" : : 0, "b" : 1}
J. { ''\ Jd" : 9, "a" : 17, "c" : 1, "b" : 1}

Answer: A,B,C,I,J

NEW QUESTION # 26
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })

A. db.test.ensurelndex( { c:l, a: 1})
B. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
C. CH db.test.ensurelndex( { a :1, c:l})
D. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})

Answer: C,D

NEW QUESTION # 27
Which of the following is a valid insert statement in mongodb? Select all valid.

A. db.test.insert({x:2,y: " apple " })
B. db.test.insert({x:2},{y: " apple " })
C. db.test.push({x:2,y: " apple " })
D. db.test.insert({x " x " :2, " y " : " apple " })

Answer: A,D

NEW QUESTION # 28
......

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