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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q162-Q167):

NEW QUESTION # 162
Which TWO mongosh commands can be used to shutdown the mongod daemon?

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

Answer: A,B

Explanation:
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().

NEW QUESTION # 163
In a replicated cluster, which of the following node would only be used during an election?

A. primary
B. hidden
C. arbiter
D. secondary

Answer: C

NEW QUESTION # 164
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 # 165
Below is a sample document of "orders" collection

A. $project

Answer: A

NEW QUESTION # 166
What is the first task that a secondary would perform on being prompted by another secondary for an election?

A. Connect to primary to confirm its availability
B. Vote for itself and then call for election
C. Vote for the first secondary so that it would become the next primary
D. Start the election process for primary

Answer: A

NEW QUESTION # 167
......

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