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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) C100DBA Prüfungsfragen mit Lösungen (Q41-Q46):

41. Frage
Which TWO mongosh commands can be used to shutdown the mongod daemon?

A. use admindb.runCommand({ killAllSessions: [ { user: " * " , db: " * " } ] })
B. use admindb.adminCommand({ " killOp " : 1, " op " : 27017 })
C. use admindb.shutdownServer()
D. db.adminCommand({ " shutdown " : 1 })

Antwort: C,D

Begründung:
MongoDB supports a clean server shutdown through the shutdown administrative command and through the mongosh helper db.shutdownServer(). Option A uses db.adminCommand({ shutdown: 1 }), which executes the shutdown command against the admin database and requests an orderly termination of the server process.
Option D explicitly switches to the admin database and calls db.shutdownServer(), the documented shell helper that wraps the same administrative behavior. Option B uses killOp, which terminates a specific database operation identified by an operation ID; port 27017 is not an operation ID and killing an operation is not equivalent to shutting down mongod. Option C uses killAllSessions, which ends logical sessions but leaves the server process running. A controlled shutdown is preferred over abruptly terminating the process because MongoDB can close resources and complete its shutdown procedures cleanly. In replica-set deployments, administrators should also consider whether the member is primary and whether a planned step- down is appropriate before maintenance. Among the commands shown, A and D are the two valid mongosh- based shutdown mechanisms.
Study Guide reference/topic:MongoDB Architecture and Core Operations - clean server shutdown, admin commands, and db.shutdownServer().

42. Frage
By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

A. 50, it
B. No limit, none
C. 200, more
D. 20, it

Antwort: D

43. Frage
Which of the following are valid json documents? Select all that apply.

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

Antwort: B,C

44. Frage
The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

A. $
B. $ elemMatch
C. Updating an array field without knowing its index is not possible.
D. $slice

Antwort: A

45. Frage
Which TWO commands can be used to check for all active operations on the current node?

A. db.currentOp({ op : " command " })
B. db.adminCommand({ currentOp : true })
C. db.currentOp({ " all " : true })
D. db.adminCommand({ " all " : currentOp})
E. db.currentOp(true)

Antwort: B,E

Begründung:
db.currentOp() is the mongosh helper used to inspect operations currently executing on a MongoDB server.
Passing true requests a broad view that includes all in-progress operations as well as additional idle/system entries, so it can be used when the administrator wants to see the complete current-operation picture. The database-command form, db.adminCommand({ currentOp: true }), invokes the corresponding administrative command and is also valid for obtaining in-progress operation information. Option A adds a filter restricting the result to operations whose op field is " command " ; it therefore does not represent all operation types.
Option B is not valid currentOp command syntax, and option E uses an all field that is not the documented special form for this helper. In modern MongoDB administration, the $currentOp aggregation stage is generally preferred for richer filtering and aggregation, but the question is testing the traditional helper and command interfaces. Therefore, C and D are the two valid choices among those presented.
Study Guide reference/topic:Performance Monitoring and Tuning - current operations, currentOp, and administrative diagnostics.

46. Frage
......

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