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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q56-Q61):

NEW QUESTION # 56
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 : { $substr[ 0 , 5 ] > > )
C. db.c.find( { b : [ 0 , 5 ] > )
D. db.c.find( { > , { b : [ 0 , 5 ] > )
E. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )

Answer: A

NEW QUESTION # 57
What does the totalCreated field mean in the output of the db.serverStatus().connections command?
> db.serverStatus().connections
{
" current " : 4,
" available " : 51196,
" totalCreated " : 5,
" active " : 2,
" threaded " : 4,
" exhaustIsMaster " : 1,
" exhaustHello " : 0,
" awaitingTopologyChanges " : 1
}

A. The number of closed connections in the server ' s history.
B. The number of connections since the server was started.
C. The number of connections since the server was set up.
D. The total number of database connections at the moment.

Answer: B

Explanation:
connections.totalCreated is a cumulative count of incoming connections created during the lifetime of the running MongoDB server process. It includes connections that are still open as well as connections that have already closed. That is why the example can show totalCreated: 5 while current: 4: five connections have been created since the process started, but only four remain current. Option A is incorrect because the counter is not limited to closed connections. Option C corresponds more closely to connections.current, which reports presently existing incoming client connections. Option B is imprecise because "since the server was set up" could imply the lifetime of the installation or deployment across restarts, whereas server-status counters generally reflect the current process lifetime. Tracking totalCreated alongside current, active, and connection- pool behavior helps administrators identify excessive connection churn, poorly configured client pools, or bursts of new connections. The most accurate interpretation among the choices is therefore the number of connections created since the server process was started, making D correct.
Study Guide reference/topic:Performance Monitoring and Tuning - serverStatus, connection metrics, and cumulative connection counters.

NEW QUESTION # 58
The MongoDB explain() method does not support which of the following verbosity mode:

A. customExecutionStats
B. queryPlanner
C. executionStats
D. allPlansExecution

Answer: C

NEW QUESTION # 59
Which of the following does MongoDB use to provide High Scalability?

A. Sharding
B. Indexing
C. Replication
D. Write Concern

Answer: A

NEW QUESTION # 60
Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

A. 0
B. 1
C. 2
D. 3
E. 4

Answer: B

NEW QUESTION # 61
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