C100DBA Practice Test Questions Updated 123 Questions
MongoDB C100DBA Dumps - Secret To Pass in First Attempt
NEW QUESTION 45
Which of the following operators is used to updated a document partially?
- A. $project
- B. $modify
- C. $update
- D. $set
Answer: D
NEW QUESTION 46
We can insert multiple documents in bulk using which of the following operations:
- A. initializeUnorderedBulk
- B. initializeBulk
- C. initializeBulkOp
- D. initializeUnorderedBulkOp
Answer: D
NEW QUESTION 47
Which command is used to determine storage capacity of specific database?
- A. mongotop
- B. mongostat
- C. dbstats
- D. constats
Answer: C
NEW QUESTION 48
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
- A. None of the above
- B. The query returned 0 documents
- C. The query used an index to fetch the results
- D. The query returned 30000 documents after scanning the documents
Answer: C
NEW QUESTION 49
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: D
NEW QUESTION 50
What tool do you use to see if you have a problem in the consumption of disk I / 0?
Answer:
Explanation:
Mongoperf
NEW QUESTION 51
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.find( { $array : {tags: "tutorial") > );
- B. db.posts.find( { tags : ["tutorial"] } );
- C. db.posts.find( { tags : "tutorial" } );
- D. db.posts.findInArray( { tags : "tutorial" > );
Answer: C
NEW QUESTION 52
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?
- A. No document will be inserted; an error will be raised
- B. A document with an _id assigned to be an Objectld
- C. A document that matches the collection's existing schema, but with null fields
- D. A document will be inserted with the same _id as the last document inserted
- E. An empty document
Answer: B
NEW QUESTION 53
Which of the following node is used during election in a replication cluster?
- A. secondary
- B. primary
- C. arbiter
- D. hidden
Answer: C
NEW QUESTION 54
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: { $elemMatch: { $gt: 3, $lt: 6 }
- B. db.inventory.find( { ratings: { $elemMatch: { $gte: 3, $lte: 6 } } } )
- C. db.inventory.find( { ratings: { ratings.$: { $gt: 5, $lt: 9 } } } )
- D. db.inventory.find( { ratings: { ratings: { $gt: 5, $lt: 9 } } } )
Answer: D
NEW QUESTION 55
What is the on-premise solution having functionality equivalent to cloud manager?
- A. Journaling
- B. Ops Manager
- C. Service Manager
- D. Replica Manager
Answer: B
NEW QUESTION 56
Which mongodb tools allow us to work with our data in a human readable format?
- A. mongoexport
- B. mongostat
- C. mongodump
- D. mongoimport
Answer: A,D
NEW QUESTION 57
Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.
- A. db.collection.insert( { a:341})
- B. db.collection.find( {a : 232} )
- C. db.collection.update({b:456>, {$inc: {a:l> })
Answer: A,C
NEW QUESTION 58
Which mongodb tool is used to report details on number of database operations in MongoDB?
- A. mongotop
- B. mongorestore
- C. mongostat
- D. mongodump
Answer: C
NEW QUESTION 59
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?
- A. To add greather redundancy
- B. For more efficient backup operations
- C. To enable certain read preference settings
- D. To protect agains network partitions
- E. To help in disaster recovery
Answer: D
NEW QUESTION 60
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION 61
Consider the following posts document:
Which of the following queries will return the documents but with only the first two tags in the tags array?
- A. db.posts.find({author:"Tom">,{tags:{$slice:2})
- B. Both "db.posts.find({author:"Tom"},{tags:{$slice:2}})" and
"db.posts.find({author:"Tom"}).limit($slice: {tags:2})" are valid. $slice works both with projection and limit. - C. db.posts.find({author:"Tom"}.limit({tags:2})
- D. db.posts.find({author:"Tom"}.limit($slice:{tags:2>)
Answer: A
NEW QUESTION 62
Which of the following does MongoDB use to provide High Scalability?
- A. Indexing
- B. Write Concern
- C. Replication
- D. Sharding
Answer: D
NEW QUESTION 63
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
- A. Table and Row
- B. Database and Table
- C. Table and Column
- D. Column and Row
Answer: A
NEW QUESTION 64
Which command can be used to rebuild the indexes on a collection in MongoDB?
- A. db.collection.createlndex({relndex:l})
- B. db.collection.createIndex({author:l}).reIndex()
- C. db.collection.reIndex({author:l})
- D. db.collection.relndexQ
Answer: D
NEW QUESTION 65
Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 >
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.
- A. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
- B. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
- D. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
Answer: B,D
NEW QUESTION 66
Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
- A. Null, Number, Object and String
- B. Null, Number, String and Object
- C. Number, Null, String and Object
- D. String, Null, Number and Object
Answer: B
NEW QUESTION 67
Which is the default mode in which the explain() command runs?
- A. executionStats
- B. customExecutionStats
- C. queryPlanner
- D. allPlansExecution
Answer: C
NEW QUESTION 68
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