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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q83-Q88):

NEW QUESTION # 83
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 : { $slice : [ 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 : [ 0 , 5 ] > )

Answer: A

NEW QUESTION # 84
Which of the following are valid json documents? Select all that apply.

A. { " a " :l, " b " :{ " b " :l, " c " : " foo " , " d " : " bar " , " e " :[l,2,4]}}
B. { }
C. { " city " : " New York " , " population " , 7999034, boros:{ " queens " , " manhattan " , " staten island "
, " the bronx " , u " brooklyn " }}
D. { " name " : " Fred Flintstone " ; " occupation " : " Miner " ; " wife " : " Wilma " }

Answer: A,B

NEW QUESTION # 85
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

Answer:

Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )

NEW QUESTION # 86
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

A. Database and Table
B. Column and Row
C. Table and Column
D. Table and Row

Answer: D

NEW QUESTION # 87
Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

A. db.posts.find({author: " Tom " > ,{tags:{$slice:2)
B. db.posts.find({author: " Tom " .limit({tags:2})
C. Both " db.posts.find({author: " Tom " },{tags:{$slice:2}}) " and " db.posts.find({author: " Tom " }).
limit($slice: {tags:2}) " are valid. $slice works both with projection and limit.
D. db.posts.find({author: " Tom " .limit($slice:{tags:2 > )

Answer: A

NEW QUESTION # 88
......

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