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MongoDB C100DBA exam duration is 90 minutes. The maximum number of attempts to pass this exam is six.

 

NEW QUESTION # 59
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

• A. Updating a document is possible only with $set
• B. Replaces the complete document with _id as 1 with the document specified in second parameter
• C. Syntax error
• D. Updates the Title of the post

Answer: B

NEW QUESTION # 60
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. 200, more
• B. No limit, none
• C. 20, it
• D. 50, it

Answer: C

NEW QUESTION # 61
Which option should be used to update all the documents with the specified condition in the MongoDB query?

• A. specify {multi : true} as the third parameter of update command
• B. specify {all: true} as the third parameter of update command
• C. updateAII instead of update
• D. specify {updateAII: true} as the third parameter of update command

Answer: A

NEW QUESTION # 62
Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

• A. db.posts.find( { post_timestamp: { $type: null } } )
• B. db.posts.find( { post_timestamp: { $fieldtype: null } } )
• C. db.posts.find( { post_timestamp: { $fieldtype: 10 } } )
• D. db.posts.find( { post_timestamp : { $type; 10 > > )

Answer: A

NEW QUESTION # 63
Which node in a replica set does accept write operation?

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

Answer: A

NEW QUESTION # 64
Which of the following are valid json documents? Select all that apply.

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

Answer: A,B

NEW QUESTION # 65
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

Answer:

Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )

NEW QUESTION # 66
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: D

NEW QUESTION # 67
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

• A. primaryPreferred
• B. secondaryPreferred
• C. nearest
• D. netLatency

Answer: C

NEW QUESTION # 68
What does the following aggregate query perform?

• A. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
• B. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
• C. Calculates the number of posts with likes between 100 and 200
• D. Fetches the posts with likes between 100 and 200 and sets their _id as null

Answer: C

NEW QUESTION # 69
Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

• A. db.posts.find({author:"Tom"}.limit({tags:2})
• B. db.posts.find({author:"Tom">,{tags:{$slice:2})
• C. Both "db.posts.find({author:"Tom"},{tags:{$slice:2}})" and "db.posts.find({author:"Tom"}).limit($slice: {tags:2})" are valid. $slice works both with projection and limit.
• D. db.posts.find({author:"Tom"}.limit($slice:{tags:2})

Answer: B

NEW QUESTION # 70
Which of the following does MongoDB use to provide High Availability and fault tolerance?

• A. Replication
• B. Sharding
• C. Write Concern
• D. Indexing

Answer: A

NEW QUESTION # 71
What is the use of mongodump and mongorestore tools?

• A. audit mongodb deployment
• B. performance tune mongodb deployment
• C. backup mongodb deployment
• D. replicate mongodb deployments

Answer: C

NEW QUESTION # 72
In which of the following scenarios is sharding not the correct option. Select all that apply.

• A. The write operations on the collection are very high
• B. The working set in the collection is expected to grow very large in size
• C. The collection is a read intensive collection with less working set
• D. The write operations on the collection are low

Answer: C,D

NEW QUESTION # 73
Which of the following operator can be used to control the number of items of an array that a query returns?

• A. $ elemMatch
• B. $slice
• C. MongoDB does not support partial retrieval of items from an array
• D. $

Answer: B

NEW QUESTION # 74
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

• A. A document that matches the collection's existing schema, but with null fields
• B. A document with an _id assigned to be an Objectld
• C. A document will be inserted with the same _id as the last document inserted
• D. An empty document
• E. No document will be inserted; an error will be raised

Answer: B

NEW QUESTION # 75
You have the following index on the toys collection:
{
"manufacturer" : 1,
"name" : 1,
"date" : -1
}
Which of the following is able to use the index for the query? Check all that apply.

• A. db.toys.find( { date : "2015-03-01", manufacturer : "Loggo", name : "Brick Set" } )
• B. db.toys.find( { name : "Big Rig Truck", date : "2013-02-01", manufacturer : "Tanko"
• C. db.toys.find( { manufacturer : "Matteo", name : "Barbara", date : "2014-07-02" } )

Answer: A,B,C

NEW QUESTION # 76
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

• A. Table and Row
• B. Table and Column
• C. Column and Row
• D. Database and Table

Answer: A

NEW QUESTION # 77
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. None of the above
• B. As an indexed query using "mylndex" because field "user.login" is indexed
• C. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login"
• D. MongoDB will need to do a table/collection scan to find matching documents
• E. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field

Answer: B

NEW QUESTION # 78
The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

• A. $match
• B. $group
• C. $project
• D. $aggregate

Answer: C

NEW QUESTION # 79
Which of the following node is used during election in a replication cluster?

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

Answer: A

NEW QUESTION # 80
Which of the following collections stores authentication credentials in MongoDB?

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

Answer: A

NEW QUESTION # 81
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

• A. Replication
• B. Properly defined user roles
• C. Sharding
• D. Put indexes on all of your documents
• E. The proper storage engine

Answer: A

NEW QUESTION # 82
What is the on-premise solution having functionality equivalent to cloud manager?

• A. Journaling
• B. Replica Manager
• C. Service Manager
• D. Ops Manager

Answer: D

NEW QUESTION # 83
Which command can be used to rebuild the indexes on a collection in MongoDB?

• A. db.collection.createIndex({author:l}).reIndex()
• B. db.collection.createlndex({relndex:l})
• C. db.collection.reIndex({author:l})
• D. db.collection.relndexQ

Answer: D

NEW QUESTION # 84
......

Preparing for the MongoDB C100DBA exam requires a solid understanding of MongoDB architecture and administration. Candidates can prepare for the exam by taking MongoDB's official training courses, reading the MongoDB documentation, and practicing their skills on real-world MongoDB deployments. Passing the MongoDB C100DBA exam is a valuable achievement for any database administrator who works with MongoDB and can open up new career opportunities.

 

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