[2022] Get Top-Rated MongoDB C100DBA Exam Dumps Now
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NEW QUESTION 13
Which of the following is true about sharding?
- A. Creating a sharded key automatically creates an index on the collection using that key
- B. We cannot change a shard key directly/automatically once it is set up
- C. Sharding is enabled at the database level
- D. A sharded environment does not support sorting functionality since the documents lie on various mongod instances
Answer: B
NEW QUESTION 14
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. Updates the Title of the post
- B. Updating a document is possible only with $set
- C. Syntax error
- D. Replaces the complete document with _id as 1 with the document specified in second parameter
Answer: D
NEW QUESTION 15
The MongoDB explain() method does not support which of the following verbosity mode:
- A. queryPlanner
- B. customExecutionStats
- C. allPlansExecution
- D. executionStats
Answer: B
NEW QUESTION 16
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. 04
- C. 06
- D. 03
Answer: B
NEW QUESTION 17
Which of the following is supported by MongoDB?
- A. Journaling
- B. Transaction Management
- C. Relationships between Collections (Primary Key Foreign Key)
- D. ACID Transactions
Answer: A
NEW QUESTION 18
Which of the following are valid json documents? Select all that apply.
- A. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- B. { }
- C. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
- D. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
Answer: B,D
NEW QUESTION 19
Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
- A. String, Null, Number and Object
- B. Null, Number, Object and String
- C. Number, Null, String and Object
- D. Null, Number, String and Object
Answer: D
NEW QUESTION 20
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 : { $type; 10 > > )
- C. db.posts.find( { post_timestamp: { $fieldtype: 10 } } )
- D. db.posts.find( { post_timestamp: { $fieldtype: null } } )
Answer: B
NEW QUESTION 21
In a sharded cluster, from which node does one stop the balancer process before initiating backup?
- A. config server node
- B. replicaset primary node
- C. Any node
- D. mongos node
Answer: D
NEW QUESTION 22
Which of the following command is used to get all the indexes on a collection?
- A. db.collection.findlndexes()
- B. db.collection.getlndexesQ
- C. db.showIndexes()
- D. db.collection.showIndexes()
Answer: B
NEW QUESTION 23
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. $project
- B. $match
- C. $aggregate
- D. $group
Answer: A
NEW QUESTION 24
What is the use of mongodump and mongorestore tools?
- A. performance tune mongodb deployment
- B. replicate mongodb deployments
- C. audit mongodb deployment
- D. backup mongodb deployment
Answer: D
NEW QUESTION 25
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 26
JSON stands for
- A. None of the above
- B. JavaScript Object Notice
- C. JavaScript Object Notation
- D. JavaScript Object Naming
Answer: C
NEW QUESTION 27
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ {
$group: { _id; "$author", x: { $sum: $likes } } } ] )
- A. Sum of likes on all the posts by an author, grouped by author
- B. Average of likes on all the posts of an author, grouped by author
- C. Sum of likes on all the posts by all the authors
- D. Number of posts by an author
Answer: A
NEW QUESTION 28
Which command can be used to rebuild the indexes on a collection in MongoDB?
- A. db.collection.reIndex({author:l})
- B. db.collection.createIndex({author:l}).reIndex()
- C. db.collection.createlndex({relndex:l})
- D. db.collection.relndexQ
Answer: D
NEW QUESTION 29
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: A
NEW QUESTION 30
What tool do you use to see if you have a problem in the consumption of disk I / 0?
Answer:
Explanation:
Mongoperf
NEW QUESTION 31
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