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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q37-Q42):

NEW QUESTION # 37
A MongoDB database administrator is asked to add the privilege find to a role named myRole.
What is the correct syntax for adding this privilege to the role in MongoDB?

A. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: {resource: { db: " testDB " , collection: " " }, actions: [ " find " ]},writeConcern: { w: " majority " },comment: " Granting find action
" })
B. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ resource: { db: " testDB " , collection: " " }, actions: [ " find " ] }] ,writeConcern: { w: " majority " },comment: " Granting find action " })
C. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ db: " testDB " , collection: " " , actions: [ " find " ] }] ,writeConcern: { w: " majority " },comment: " Granting find action " })
D. db.runCommand({grantPrivilegesToRole: " myRole " ,privileges: [{ resource: { db: " testDB " , collection: " " }, actions: " find " }],writeConcern: { w: " majority " },comment: " Granting find action "
})

Answer: B

Explanation:
The grantPrivilegesToRole command requires privileges to be an array of privilege documents. Each privilege document must contain a resource document and an actions array. Option A uses exactly that structure: the resource targets testDB with an empty collection name, which represents the database-level collection scope used by MongoDB ' s privilege model, and the actions list contains " find " . Option B omits the required resource wrapper and incorrectly places db and collection directly in the privilege document. Option C supplies privileges as a single document rather than as the required array. Option D has the correct resource structure but supplies actions as a scalar string instead of an array. The find action grants the ability to perform supported read operations on the specified resource scope, subject to the role ' s other inherited privileges. The shown writeConcern and comment fields are legitimate command options and do not change the structural requirement. Consequently, option A is the only choice that conforms to MongoDB ' s documented privilege document format.
Study Guide reference/topic:Security, Networking, and Encryption - user-defined roles, privilege documents, resources, actions, and grantPrivilegesToRole.

NEW QUESTION # 38
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $pop: 1 } } }] )
B. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
C. db.population.aggregate( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )
D. db.population.aggregate( [{ $group: { _id: { state: "$state", city; "$city" },pop: { $sum: 1 > > >] )

Answer: C

NEW QUESTION # 39
Which of the following is a valid insert statement in mongodb? Select all valid.

A. db.test.insert({"x":2, "y":"apple"})
B. db.test.push({x:2,y:"apple"})
C. db.test.insert({x:2,y:"apple"})
D. db.test.insert({x:2},{y:"apple"})

Answer: A,C

NEW QUESTION # 40
As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

A. $sort moves before $match
B. MongoDB does not do any movements by default and will use the order provided
C. Providing these parameters in any order does not impact the performance
D. $match moves before $sort

Answer: D

NEW QUESTION # 41
Which of the following node is used during election in a replication cluster?

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

Answer: B

NEW QUESTION # 42
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