[Dec 27, 2021] MongoDB C100DBA Real Exam Questions and Answers FREE
Pass MongoDB C100DBA Exam Info and Free Practice Test
NEW QUESTION 23
Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
- A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u
"flipar" } - B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
- C. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" :
v u "flipar" } - D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u
"flipar"}
Answer: B,C
NEW QUESTION 24
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. Syntax error
- B. Updating a document is possible only with $set
- C. Updates the Title of the post
- D. Replaces the complete document with _id as 1 with the document specified in second parameter
Answer: D
NEW QUESTION 25
'mongoimport' command is used for
- A. Multiple command insertion
- B. None of the above
- C. Batch data insertion
- D. Multiple command import
Answer: C
NEW QUESTION 26
Which of the following aggregation commands in MongoDB does not support sharded collections?
- A. All of the above
- B. mapReduce
- C. aggregate
- D. group
Answer: D
NEW QUESTION 27
Which of the following is true about sharding?
- A. Creating a sharded key automatically creates an index on the collection using that key
- B. A sharded environment does not support sorting functionality since the documents lie on various mongod instances
- C. Sharding is enabled at the database level
- D. We cannot change a shard key directly/automatically once it is set up
Answer: D
NEW QUESTION 28
Update If Correct is an approach for which of the following concepts in MongoDB:
- A. Performance Management
- B. Transaction Management
- C. Atomicity
- D. Concurrency Control
Answer: D
NEW QUESTION 29
You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?
- A. 0
- B. 06
- C. 03
- D. 04
Answer: D
NEW QUESTION 30
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION 31
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. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login"
- B. None of the above
- C. MongoDB will need to do a table/collection scan to find matching documents
- D. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field
- E. As an indexed query using "mylndex" because field "user.login" is indexed
Answer: E
NEW QUESTION 32
Which of the following is incorrect statement about find and findOne operations in MongoDB?
- A. find.limit(l) is not the same query as findOne()
- B. findQ and findOneQ returns cursors to the collection documents
- C. findQ returns all the documents in a collection while findOne() retrieves only the first one.
- D. findOneQ returns the actual first document retrieved from a collection
Answer: B
NEW QUESTION 33
If you have created a compound index on (A,B, C) which of the following access pattern will not be able to utilize the index?
- A. A
- B. A, B
- C. A, B, C
- D. B, C
Answer: D
NEW QUESTION 34
Below is a sample document of "orders" collection
Answer:
Explanation:
$sort
NEW QUESTION 35
In what format does mongodump creates backup files?
- A. XML
- B. SOAP
- C. BSON
- D. JSON
Answer: C
NEW QUESTION 36
What is the on-premise solution having functionality equivalent to cloud manager?
- A. Journaling
- B. Ops Manager
- C. Service Manager
- D. Replica Manager
Answer: B
NEW QUESTION 37
What does the totalKeysExamined field returned by the explain method indicate?
- A. Number of documents that match the query condition
- B. Number of documents scanned
- C. Number of index entries scanned
- D. Details the completed execution of the winning plan as a tree of stages
Answer: C
NEW QUESTION 38
What is the first task that a secondary would perform on being prompted by another secondary for an election?
- A. Start the election process for primary
- B. Connect to primary to confirm its availability
- C. Vote for itself and then call for election
- D. Vote for the first secondary so that it would become the next primary
Answer: B
NEW QUESTION 39
Which option should be used to update all the documents with the specified condition in the MongoDB query?
- A. specify {updateAII: true} as the third parameter of update command
- B. updateAII instead of update
- C. specify {multi : true} as the third parameter of update command
- D. specify {all: true} as the third parameter of update command
Answer: C
NEW QUESTION 40
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
- A. All of the above
- B. update users collection and run db.enableAuthenticationQ
- C. update users collection and restart mongodb with -auth option
- D. update users collection and restart mongodb
Answer: C
NEW QUESTION 41
When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?
- A. Always
- B. Never
- C. When the many is very large
- D. When the many is not very large
Answer: D
NEW QUESTION 42
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