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To take the MongoDB C100DBA Exam, candidates are required to have a solid understanding of database concepts, including data modeling and schema design, indexing, replication, and sharding. They should also be familiar with MongoDB's query language and have experience working with MongoDB tools such as Compass, mongodump, and mongorestore. Additionally, candidates should have hands-on experience with database administration tasks such as backup and recovery, security and authentication, and performance tuning.

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q161-Q166):

NEW QUESTION # 161
A MongoDB administrator needs to create a new role with only the read privileges for the products database.
What command should the administrator use?

A. db.createRole({ role: " productRead " , privileges: [ { resource: { db: " products " , collection: " * " }, actions: [ " readWrite " ] } ] , roles: [] }, { w: " majority " , wtimeout: 5000 })
B. db.createRole({ role: " productRead " , privileges: [ { resource: { db: " products " , collection: " * " }, actions: [ " readAnyDatabase " ] } ] , roles: [] }, { w: " majority " , wtimeout: 5000 })
C. db.createRole({ role: " productRead " , privileges: [ { resource: { db: " products " , collection: " * " }, actions: [ " read " ] } ] , roles: [] }, { w: " majority " , wtimeout: 5000 })
D. db.createRole({ role: " productRead " , privileges: [ { resource: { db: " products " , collection: " " }, actions: [ " find " ] } ] , roles: [] }, { w: " majority " , wtimeout: 5000 })

Answer: D

Explanation:
MongoDB custom roles are defined in terms of privileges, and each privilege specifies a resource plus one or more allowed actions. For read/query access, find is a valid privilege action. To represent all normal collections in a specified database, MongoDB uses a resource document with the target database and an empty collection name, for example { db: " products " , collection: " " }. Option B therefore combines the correct resource scope with the find action and does not grant write capability. The distractors confuse built-in role names with privilege actions. read, readWrite, and readAnyDatabase are built-in roles or role concepts, not the appropriate action values for the privileges[].actions list shown here. Likewise, a literal " * " collection value is not the documented database-wide resource form for this custom privilege. In practice, an administrator could also assign MongoDB ' s built-in read role rather than creating a custom role if its permissions exactly match the requirement. Given the specific createRole() choices, however, option B is the technically correct construction.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, custom roles, resources, and privilege actions.

NEW QUESTION # 162
Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

Which of the following commands will find all the posts that have been tagged as tutorial.

A. db.posts.findInArray( { tags : "tutorial" > );
B. db.posts.find( { $array : {tags: "tutorial") > );
C. db.posts.find( { tags : "tutorial" } );
D. db.posts.find( { tags : ["tutorial"] } );

Answer: C

NEW QUESTION # 163
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: E

NEW QUESTION # 164
Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:

Which of the following query will return all the documents where the ratings array contains elements that in some combination satisfy the query conditions?

A. db.inventory.find( { ratings: { ratings.$: { $gt: 5, $lt: 9 } } } )
B. db.inventory.find( { ratings: { $elemMatch: { $gt: 3, $lt: 6 }
C. db.inventory.find( { ratings: { ratings: { $gt: 5, $lt: 9 } } } )
D. db.inventory.find( { ratings: { $elemMatch: { $gte: 3, $lte: 6 } } } )

Answer: C

NEW QUESTION # 165
What command is used to check the value that " logLevel " is set to?

A. db.getParameter( " logLevel " )
B. db.getParameter({ " logLevel " : 1})
C. db.adminCommand({ getParameter: 1, " logLevel " : 1 })
D. db.runCommand({ getParameter: 1, " logLevel " : 1 })

Answer: C

Explanation:
logLevel is a MongoDB server parameter, and server parameters are retrieved through the administrative getParameter database command. The documented and unambiguous mongosh form is db.adminCommand({ getParameter: 1, logLevel: 1 }), which executes the command against the admin database and requests the current value of logLevel. The first numeric value activates the command, while the logLevel field identifies the parameter to return. Options B and C refer to a db.getParameter() helper that is not the documented interface. Option A uses db.runCommand() without explicitly switching to the admin database. Because getParameter is an administrative command, db.adminCommand() is the correct and reliable form among the choices. Administrators use server parameters to inspect and, where supported, tune aspects of mongod or mongos behavior. logLevel controls global diagnostic verbosity, while component-specific verbosity can be managed through the logging configuration. For this question, option D precisely matches the expected administrative syntax. Checking the current value before changing logging settings is also a sound operational practice during troubleshooting.
Study Guide reference/topic:Performance Monitoring and Tuning - runtime server parameters, logging configuration, and getParameter.

NEW QUESTION # 166
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