C100DBA Dumps with Practice Exam Questions Answers
C100DBA by MongoDB Certified DBA Associate Actual Free Exam Practice Test
What is the number of questions for the MongoDB C100DBA Exam
The number of questions is 60 multiple-choice questions.
What Do You Need to Pass the MongoDB C100DBA Exam?
The only thing you need to pass the exam is knowledge of topics discussed in the exam study guide, time management skills, and practice. Posts of the best-selling MongoDB C100DBA exam dumps are also available on DumpsTorrent, but they are not expensive. It is advised to purchase this practice test, along with some useful documents to prepare for this examination. Of course, there are many other techniques that can be applied to how you can pass the exam, but it depends on your skills and knowledge of MongoDB. When taking the exam study guide it is important to be very familiar with what is discussed in each chapter. After all of that is done you should practice taking exams online so that you can familiarize yourself with whatever question type you expect during the actual exam. Posts with likes will typically stay up on the top of the listings. If you need to become MongoDB C100DBA certified it is necessary to post the relevant information that will help your clients better.
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The average salary of a MongoDB C100DBA Exam in different countries, defined in MongoDB C100DBA Exam, is as follow:
- United States: $64,600
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- Germany: 62000 EUR
- Canada: 64000 CAD
- United Kingdom: 62000 GBP
NEW QUESTION 29
Which of the following commands can cause the database to be locked?
- A. Inserting data
- B. Map-reduce
- C. Issuing a query
- D. All of the above
Answer: D
NEW QUESTION 30
The difference between $push and $addToSet is:
- A. $addToSet adds the item to the field only if the new item is of the same datatype
- B. $addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not
- C. $addToSet needs the fields to be already present while $push will work even if the field is not present
- D. There is no major difference between them. $addToSet is a deprecated version of $push.
Answer: B
NEW QUESTION 31
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
- A. None of the above
- B. The query returned 0 documents
- C. The query returned 30000 documents after scanning the documents
- D. The query used an index to fetch the results
Answer: D
NEW QUESTION 32
What does the following aggregate query perform?
- A. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
- B. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
- C. Calculates the number of posts with likes between 100 and 200
- D. Fetches the posts with likes between 100 and 200 and sets their _id as null
Answer: C
NEW QUESTION 33
Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.
- A. Authentication
- B. Multi-statement transactions
- C. Joins
Answer: B,C
NEW QUESTION 34
By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?
- A. No limit, none
- B. 20, it
- C. 50, it
- D. 200, more
Answer: B
NEW QUESTION 35
When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?
- A. Never
- B. When the many is not very large
- C. When the many is very large
- D. Always
Answer: B
NEW QUESTION 36
Consider the following posts document:
Which of the following queries will return the documents but with only the first two tags in the tags array?
- A. db.posts.find({author:"Tom"}.limit({tags:2})
- B. db.posts.find({author:"Tom">,{tags:{$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 37
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( { tags : ["tutorial"] } );
- C. db.posts.find( { $array : {tags: "tutorial") > );
- D. db.posts.find( { tags : "tutorial" } );
Answer: D
NEW QUESTION 38
Which command is used to determine storage capacity of specific database?
- A. constats
- B. mongostat
- C. dbstats
- D. mongotop
Answer: C
NEW QUESTION 39
JSON stands for
- A. JavaScript Object Naming
- B. None of the above
- C. JavaScript Object Notation
- D. JavaScript Object Notice
Answer: C
NEW QUESTION 40
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. 03
- B. 06
- C. 04
- D. 0
Answer: C
NEW QUESTION 41
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
- A. Column and Row
- B. Table and Column
- C. Database and Table
- D. Table and Row
Answer: D
NEW QUESTION 42
We can insert multiple documents in bulk using which of the following operations:
- A. initializeBulkOp
- B. initializeUnorderedBulkOp
- C. initializeUnorderedBulk
- D. initializeBulk
Answer: B
NEW QUESTION 43
What is the defau size of a GridFS chunk?
- A. 16 MB
- B. 2 MB
- C. 255 K
- D. 1 MB
Answer: C
NEW QUESTION 44
You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?
- A. Failover happens automatically
- B. Failover needs to be done manually
- C. Switchover happens automatically
- D. Switchover needs to be done manually
Answer: A
NEW QUESTION 45
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( { name : "Big Rig Truck", date : "2013-02-01", manufacturer : "Tanko"
- B. db.toys.find( { manufacturer : "Matteo", name : "Barbara", date : "2014-07-02" } )
- C. db.toys.find( { date : "2015-03-01", manufacturer : "Loggo", name : "Brick Set" } )
Answer: A,B,C
NEW QUESTION 46
What is the maximum size of Index Key Limit and Number of Indexes per collection?
- A. 1024 bytes and unlimited indexes
- B. 64 bytes and 1024 indexes
- C. 1024 bytes and 64 indexes
- D. 12 mega bytes and 64 indexes
Answer: C
NEW QUESTION 47
What tool do you use to see if you have a problem in the consumption of disk I / 0?
Answer:
Explanation:
Mongoperf
NEW QUESTION 48
Which of the following needs to be performed prior to initiate backup on a sharded cluster?
- A. db.stopBalancer( )
- B. db.stopServer( )
- C. sh.stopServer( )
- D. sh.stopBalancer( )
Answer: D
NEW QUESTION 49
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, d : 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- D. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
Answer: B,C
NEW QUESTION 50
Which of the following is a valid Replica Set configuration if you want:
1-Have 3 copies of everything
2- That RS3 is never primary
2- That RSI and RS2 can be primary?
You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need
3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary?
The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)
- A. ORS3
- B. O arbiter
- C. RSO
- D. ORS1
- E. ORS2
Answer: D
NEW QUESTION 51
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
- A. nearest
- B. netLatency
- C. primaryPreferred
- D. secondaryPreferred
Answer: A
NEW QUESTION 52
What tool do you use if you want to extract a CSV from mongo?
Answer:
Explanation:
mongoexport
NEW QUESTION 53
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
- A. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
- B. db.test.ensurelndex( { c:l, a: 1})
- C. CH db.test.ensurelndex( { a :1, c:l})
- D. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})
Answer: C,D
NEW QUESTION 54
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