Updated Oct-2024 Official licence for C100DBA Certified by C100DBA Dumps PDF [Q57-Q77]

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Updated Oct-2024 Official licence for C100DBA Certified by C100DBA Dumps PDF

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MongoDB C100DBA certification exam is a challenging but rewarding exam that can help professionals demonstrate their expertise in MongoDB database administration. It covers a wide range of topics related to database administration and is based on the latest version of MongoDB. Passing the exam can help professionals advance their careers in the field and stand out to potential employers.

NEW QUESTION 57
Which of the following collections stores authentication credentials in MongoDB?

test.users

local.users

system.users

users.users

NEW QUESTION 58
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?

NEW QUESTION 59
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

db.population.aggregate( [{ $group: { _id: { state: “$state”, city: “$city” },pop: { $pop: 1 } } }] )

db.population.aggregate( [{ $group: { _id: { city: “$city” },pop: { $sum: “$pop” } } }] )Multi Document Transaction is not supported by MongoDB

db.population.aggregate( [{ $group: { _id: { state: Estate”, city: “$city” },pop: { $sum: “$pop” } } }] )

db.population.aggregate( [{ $group: { _id: { state: Estate”, city: “$city” },pop: { $sum: 1 > > >] )

NEW QUESTION 60
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?

NEW QUESTION 61
In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

Even

Odd

Depends on the application architecture

NEW QUESTION 62
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

A document will be inserted with the same _id as the last document inserted

A document that matches the collection’s existing schema, but with null fields

A document with an _id assigned to be an Objectld

An empty document

No document will be inserted; an error will be raised

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?

NEW QUESTION 64
What does the totalKeysExamined field returned by the explain method indicate?

Number of documents that match the query condition

Number of index entries scanned

Details the completed execution of the winning plan as a tree of stages

Number of documents scanned

NEW QUESTION 65
Aggregation Pipelines have a limit of:

No limit on document and 100 MB RAM

2 MB document and no limit on RAM

2 MB document and 100 MB RAM

16 MB document and 100 MB RAM

NEW QUESTION 66
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

mapReduce

group

aggregate

All of the above

NEW QUESTION 67
In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)

Skip and limit nullify each other. Hence returning the first five documents

Limits the first five documents and then return them in reverse order

Skips the first five documents and returns the sixth document five times

Skips the first five documents and returns the next five

NEW QUESTION 68
The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

$ elemMatch

$slice

Updating an array field without knowing its index is not possible.

NEW QUESTION 69
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like “%john%”

db.posts.find( { author: /John/ } )

db.posts.find( { author: /AjohnA/ > )

db.posts.find( { $like: {author: /John/} } )

db.posts.find( { author: {$like: /John/} } )

NEW QUESTION 70
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called “sample”. Check all that apply.
db.sample.find( { “$or” : [ { “a” : { “$in” : [ 3, 10] > }, { “b” : { “$lt” : 2 > > ] > )

{”__id” :3, “a”: 4, “c” :0, “b” :14}

{”_Jd” :7, “a”: 8, “c” :1, “b” :7}

{“.Jd” :6, “a”: 1, “c” :1, “b” :5}

{ ”Jd” :9, “a”: 17, “c”: 1, “b”: 1}

{ Jd” :10,”a”: 3, “c”: 1, “b”: 1}

{“.Jd” :: 2, “a”: 2, “c” :: 0, “b”: 1}

{“.Jd” :: 4, “a”: 5, “c” :: 0, “b”: 17}

{“.Jd” :: 1, “a”: 0, “c” :: 0, “b”: 2}

{“.Jd” :: 5, “a”: 3, “c” :: 0, “b”: 12}

{“.Jd” :: 8, “a”: 11, “c”: 1, “b”: 0}

NEW QUESTION 71
In a replicated cluster, which of the following node would only be used during an election?

arbiter

primary

hidden

secondary

NEW QUESTION 72
Write the command(s) are correct to enable sharding on a database “testdb” and shard a collection “testCollection” with _id as shard key.

sh.enableSharding(“testdb”) & sh.shardCollection(“testdb.testCollection”, {_id : 1 }, true )

NEW QUESTION 73
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

db.posts.createIndex({^comments.$.author”:-l});

db. posts.createIndex({^comments.author” :1});

db.posts.createIndex({^commerits.author”;-!});

NEW QUESTION 74
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })

db.test.ensurelndex( { c:l, a: 1})

db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})

CH db.test.ensurelndex( { a :1, c:l})

db.test.ensurelndex( { a: 1, b :1, c:l, d:l})

NEW QUESTION 75
Which of the following commands will return all the posts with number of likes greater than 100 and less than 200, both inclusive?

db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );

db.posts.find({ likes : { $gt : 100 , $lte : 200 } } );

db.posts.find({ likes : { $gte : 100, $lt : 200 } } );

db.posts.find({ likes : { $gt : 100, $lt : 200 > > );

NEW QUESTION 76
The difference between $push and $addToSet is:

$addToSet needs the fields to be already present while $push will work even if the field is not present

$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

$addToSet adds the item to the field only if the new item is of the same datatype

There is no major difference between them. $addToSet is a deprecated version of $push.

NEW QUESTION 77
Consider the following example document from the sample collection. All documents in this collection have the same schema.

Which of the following queries will replace this with the document.

db.sample.update( { “_id” : 3 } , { “$set” : { “_id” : 7 , “c” : 4 } } )

db.sample.update( { “_id” : 3 } , { “_id” : 7 , “c” : 4 } , { “justOne” : true } ) // This operation cannot be done with a single query.

db.sample.update( { “_id” : 3 } , { “_id” : 7 , “c” : 4 , { “$unset” : [ “a” , “b” ] } } )

db.sample.update( { “_id” : 3 } , { “_id” : 7 , “c” : 4 } )

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MongoDB C100DBA certification exam is an excellent opportunity for individuals who want to demonstrate their skills and knowledge in MongoDB database administration. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification is globally recognized, and it can help the candidate to enhance their career opportunities in the field of database administration. C100DBA exam covers a wide range of topics related to database administration, and passing the exam requires a solid understanding of MongoDB concepts and hands-on experience in database administration.

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