C100DBA Certification Practice - C100DBA Learning Mode

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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q145-Q150):

NEW QUESTION # 145
Consider the following example document:
{
"_id": Objectld("5360c0a0a655a60674680bbe"),
"user"
"login": "irOn"
"description": "Made of steel"
"date": ISODate("2014-04-30T09:16:45.836Z"),
}
>
and index creation command:
db.users.createlndex( { "user.login": 1, "user.date": -1 }, "mylndex" )
When performing the following query:
db.users.find( { "user.login": /Air.*/ }, { "user":1, "_id":0 } ).sort( { "user.date":1 } )
which of the following statements correctly describe how MongoDB will handle the query? Check all that apply.

A. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login"
B. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field
C. None of the above
D. MongoDB will need to do a table/collection scan to find matching documents
E. As an indexed query using "mylndex" because field "user.login" is indexed

Answer: E

NEW QUESTION # 146
Which of the following operators is used to updated a document partially?

A. $modify
B. $project
C. $set
D. $update

Answer: C

NEW QUESTION # 147
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?

A. To protect agains network partitions
B. To help in disaster recovery
C. To enable certain read preference settings
D. For more efficient backup operations
E. To add greather redundancy

Answer: A

NEW QUESTION # 148
Which of the following collections stores authentication credentials in MongoDB?

A. system.users
B. users.users
C. local.users
D. test.users

Answer: A

NEW QUESTION # 149
Which of the following is true about aggregation framework?

A. Pipeline expressions are stateless except accumulator expressions used with $group operator
B. A single aggregation framework operator can be used more than once in a query
C. Each aggregation operator need to return atleast one of more documents as a result
D. the aggregate command operates on a multiple collection

Answer: A,B,C

NEW QUESTION # 150
......

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