Provide MongoDB C100DBA Practice Test Engine for Preparation
Detailed New C100DBA Exam Questions for Concept Clearance
MongoDB C100DBA is a certification exam for MongoDB Certified DBA Associate. C100DBA exam is based on MongoDB 4.4, which is the latest version of MongoDB. C100DBA exam is designed to test the candidate's knowledge and skills in administering MongoDB deployments. C100DBA exam covers various topics such as MongoDB architecture, installation, configuration, security, backup and recovery, and performance optimization.
NEW QUESTION # 41
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. Fetches the posts with likes between 100 and 200 and sets their _id as null
- C. Calculates the number of posts with likes between 100 and 200
- D. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
Answer: C
NEW QUESTION # 42
What does the following $slice query return using the following command? db.posts.find( {}, { comments: {
$slice: [ -10, 5 ] } } )
- A. Returns 10 comments, beginning with the last
- B. Returns 10 comments, beginning with the first
- C. Returns 5 comments, beginning with the first 10 items
- D. Returns 5 comments, beginning with the last 10 items
Answer: D
NEW QUESTION # 43
Which of the following is supported by MongoDB?
- A. ACID Transactions
- B. Transaction Management
- C. Journaling
- D. Relationships between Collections (Primary Key Foreign Key)
Answer: C
NEW QUESTION # 44
In what format does mongodump creates backup files?
- A. XML
- B. SOAP
- C. BSON
- D. JSON
Answer: C
NEW QUESTION # 45
Which of the following are valid json documents? Select all that apply.
- A. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
- B. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
- C. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- D. { }
Answer: A,D
NEW QUESTION # 46
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. 06
- B. 03
- C. 0
- D. 04
Answer: D
NEW QUESTION # 47
In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 48
Which command is used to determine storage capacity of specific database?
- A. mongotop
- B. dbstats
- C. constats
- D. mongostat
Answer: B
NEW QUESTION # 49
As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:
- A. MongoDB does not do any movements by default and will use the order provided
- B. Providing these parameters in any order does not impact the performance
- C. $match moves before $sort
- D. $sort moves before $match
Answer: C
NEW QUESTION # 50
Which of the following operator can be used to control the number of items of an array that a query returns?
- A. MongoDB does not support partial retrieval of items from an array
- B. $
- C. $slice
- D. $ elemMatch
Answer: C
NEW QUESTION # 51
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
- A. Properly defined user roles
- B. Put indexes on all of your documents
- C. Sharding
- D. Replication
- E. The proper storage engine
Answer: D
NEW QUESTION # 52
Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.
- A. db.collection.update({b:456>, {$inc: {a:l> })
- B. db.collection.insert( { a:341})
- C. db.collection.find( {a : 232} )
Answer: A,B
NEW QUESTION # 53
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 # 54
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( { date : "2015-03-01", manufacturer : "Loggo", name : "Brick Set" } )
- C. db.toys.find( { manufacturer : "Matteo", name : "Barbara", date : "2014-07-02" } )
Answer: A,B,C
NEW QUESTION # 55
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 # 56
Which of the following commands will return all the posts with number of likes greater than 100 and less than
200, both inclusive?
- A. db.posts.find({ likes : { $gt : 100 , $lte : 200 } } );
- B. db.posts.find({ likes : { $gte : 100, $lt : 200 } } );
- C. db.posts.find({ likes : { $gt : 100, $lt : 200 > > );
- D. db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );
Answer: D
NEW QUESTION # 57
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
- A. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
- B. db.c.find( { > , { b : [ 0 , 5 ] > )
- C. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
- D. db.c.find( { b : [ 0 , 5 ] > )
- E. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )
Answer: E
NEW QUESTION # 58
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. netLatency
- C. nearest
- D. secondaryPreferred
Answer: C
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. Updates the Title of the post
- C. Replaces the complete document with _id as 1 with the document specified in second parameter
- D. Syntax error
Answer: C
NEW QUESTION # 60
The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:
- A. <replicasetid>.oplog.rs
- B. oplog.rs
- C. local.oplog.rs
- D. <database>..oplog.rs
Answer: C
NEW QUESTION # 61
The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.
- A. $
- B. Updating an array field without knowing its index is not possible.
- C. $slice
- D. $ elemMatch
Answer: A
NEW QUESTION # 62
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 # 63
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
NEW QUESTION # 64
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
- A. The query returned 30000 documents after scanning the documents
- B. The query returned 0 documents
- C. The query used an index to fetch the results
- D. None of the above
Answer: C
NEW QUESTION # 65
What is the maximum size of a MongoDB document
- A. 16 MB
- B. 2 MB
- C. There is no maximum size. It depends on the RAM.
- D. 12 MB
Answer: A
NEW QUESTION # 66
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Is This Certification Worth It?
This certification not only shows how much you know about MongoDB but also shows all your past experiences with MongoDB. Having this certification can be very helpful for those who are planning on applying for a job where knowledge of this database is required. Also, having this certification will make you stand out among other applicants because most employers tend to favor employees who are certified. Posts with likes and comments will help you gain the recognition you deserve. This certification will allow you to have a chance at many job opportunities. With this certification, employers will see how experienced you are with MongoDB without having to actually see your knowledge. The only way the employers can carve out a good impression is if they meet with you before making a hiring decision. For those who are planning on applying for a job where knowledge of this database is required, I would say that MongoDB C100DBA exam certification is definitely worth it.
Real life experience in a field where MongoDB is being used will give you an advantage over other applicants. Because of the continued increase of demand for MongoDB, many organizations have started to hire candidates with these skills. MongoDB C100DBA exam certification will be useful for those who are planning on applying for a job that requires knowledge of MongoDB. MongoDB C100DBA Dumps will help you get this certification. Having this certification would help you stand out among other applicants because most employers tend to favor employees who are certified. It is worth mentioning that having this certification will make you more valuable as an employee because the company will know right away how knowledgeable you are on their system.
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