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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q115-Q120):

NEW QUESTION # 115
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

A. A document that matches the collection's existing schema, but with null fields
B. An empty document
C. No document will be inserted; an error will be raised
D. A document will be inserted with the same _id as the last document inserted
E. A document with an _id assigned to be an Objectld

Answer: E

NEW QUESTION # 116
Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

A. Clients read from the nearest member of a replica ser by default
B. Members of a replica set may replicate data from any other data-bearing member of the set by default
C. Operations on the primary are recorded in a capped collection called the oplog

Answer: C

NEW QUESTION # 117
What is the defau size of a GridFS chunk?

A. 1 MB
B. 16 MB
C. 2 MB
D. 255 K

Answer: D

NEW QUESTION # 118
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >

A. db.c.find( { > , { b : [ 0 , 5 ] > )
B. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
C. db.c.find( { b : [ 0 , 5 ] > )
D. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
E. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )

Answer: E

NEW QUESTION # 119
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( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )
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( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB

Answer: B

NEW QUESTION # 120
......

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