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MongoDB C100DBA Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Security and Access Control	15%	- Role-based access control - Encryption, auditing, and security best practices - Authentication mechanisms
Topic 2: MongoDB Architecture and Deployment	20%	- Core concepts, JSON/BSON, data model - Storage engines and server management - Installation and configuration
Topic 3: Backup, Recovery and Maintenance	10%	- Data consistency and integrity checks - Logical and physical backup methods - Restore procedures and disaster recovery
Topic 4: Sharding and Scalability	10%	- Shard keys, chunk management, balancing - Sharded cluster architecture - Query routing and cluster operations
Topic 5: CRUD Operations and Indexing	20%	- Create, Read, Update, Delete operations - Query optimization and aggregation - Index types, creation, and management
Topic 6: Monitoring, Performance and Troubleshooting	10%	- Performance tuning and optimization - Monitoring tools and metrics - Diagnostics and resolving common issues
Topic 7: Replication and High Availability	15%	- Deployment and maintenance of replica sets - Failover, elections, read/write concern - Replica set architecture and components

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Latest training guide for MongoDB C100DBA

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q26-Q31):

NEW QUESTION # 26
Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u
"flipar"}
C. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u
"flipar" }
D. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" :
v u "flipar" }

Answer: A,D

NEW QUESTION # 27
Which of the following is true about sharding?

A. Creating a sharded key automatically creates an index on the collection using that key
B. We cannot change a shard key directly/automatically once it is set up
C. Sharding is enabled at the database level
D. A sharded environment does not support sorting functionality since the documents lie on various mongod instances

Answer: B

NEW QUESTION # 28
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( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
B. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
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: A

NEW QUESTION # 29
Consider the following example document from the sample collection. All documents in this collection have the same schema.

Which of the following queries will replace this with the document.

A. db.sample.update( { "_id" : 3 } , { "$set" : { "_id" : 7 , "c" : 4 > > )
B. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 , { "$unset" : [ "a" , "b" ] } } )
C. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > , { "justOne" : true > ) / This operation cannot be done with a single query.
D. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > )

Answer: B

NEW QUESTION # 30
Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u "flipar"}
C. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }
D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u "flipar" }

Answer: A,C

NEW QUESTION # 31
......

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