Authentic MongoDB C100DBA Exam Dumps

Question No: 1

MultipleChoice

Given a replica set with five data-bearing members, suppose the main goes down with operations in its oplog that have been copied from the main to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?

Options

Amissing operations will need to be manually re-performed

Bthe secondary with the most current oplog will be elected primary

Creads will be stale until the primary comes back up

Dthe primary may roll back the operations once it recovers

Ethe most current secondary will roll back the operations following the election

Question No: 2

MultipleChoice

Which of the following operator can be used to control the number of items of an array that a query returns?

Options

A$ elemMatch

B$slice

C$

DMongoDB does not support partial retrieval of items from an array

Question No: 3

MultipleChoice

What is the use of mongodump and mongorestore tools?

Options

Abackup mongodb deployment

Baudit mongodb deployment

Cperformance tune mongodb deployment

Dreplicate mongodb deployments

Question No: 4

MultipleChoice

What is the output of following two commands in MongoDB: db. posts. insert({n_id":l}) db.posts.insert({"_id":l})

Options

ATwo documents will be inserted with _id as 1

BMongoDB will automatically increment the _id of the second document as 2

CThis will throw a duplicate key error

DIt will insert two documents and throw a warning to the user

Question No: 5

MultipleChoice

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)

Options

AORS1

BORS2

CORS3

DO arbiter

ERSO

Question No: 6

MultipleChoice

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 > > ] > )

Options

A{''_ _id' : 3, 'a' : 4, 'c' : 0, 'b' : 14}

B{''_ Jd' : 7, 'a' : 8, 'c' : 1, 'b' : 7}

C{'. Jd' : 6, 'a' : 1, 'c' : 1, 'b' : 5}

D{ ''\ Jd' : 9, 'a' : 17, 'c' : 1, 'b' : 1}

E{ \ Jd' : 10,'a' : 3, 'c' : 1, 'b' : 1}

F{'. Jd' : : 2, 'a' : 2, 'c' : : 0, 'b' : 1}

G{'. Jd' : : 4, 'a' : 5, 'c' : : 0, 'b' : 17}

H{'. Jd' : : 1, 'a' : 0, 'c' : : 0, 'b' : 2}

I{'. Jd' : : 5, 'a' : 3, 'c' : : 0, 'b' : 12}

J{'. Jd' : : 8, 'a' : 11, 'c' : 1, 'b' : 0}

Question No: 7

MultipleChoice

Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:'ruben',apellido:'gomez'},{nombre:l,apellido:l,aficion:l});

Options

A{ '-id' : Objectld('580a42b5dfblb5al7427d302'), 'nombre' : 'ruben', 'apellido' : 'gomez', 'aficion' : v u 'flipar' }

B{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'Luis', 'apellido' : 'gomez', 'aficion' : u 'flipar' }

C{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'Pablo' , 'aficion' : u 'flipar'}

D{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'gomez' >

Question No: 8

MultipleChoice

What is the output of following two commands in MongoDB: db. posts. insert({n_id':l}) db.posts.insert({'_id':l})

Options

ATwo documents will be inserted with _id as 1

BMongoDB will automatically increment the _id of the second document as 2

CThis will throw a duplicate key error

DIt will insert two documents and throw a warning to the user

Question No: 9

MultipleChoice

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 ] >

Options

Adb.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )

Bdb.c.find( { b : [ 0 , 5 ] > )

Cdb.c.find( { > , { b : { $substr[ 0 , 5 ] > > )

Ddb.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )

Edb.c.find( { > , { b : [ 0 , 5 ] > )

Question No: 10

MultipleChoice

What is the equivalent command in MongoDB for the following SQL query?

SELECT * FROM posts WHERE author like "%john%"

Options

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

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

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

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

Question No: 11

MultipleChoice

Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

Options

A{ '-id' : Objectld('580a42b5dfblb5al7427d302'), 'nombre' : 'ruben', 'apellido' : 'gomez', 'aficion' : v u 'flipar' }

B{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'Luis', 'apellido' : 'gomez', 'aficion' : u 'flipar' }

C{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'Pablo' , 'aficion' : u 'flipar'}

D{ '_id' : Objectld('580a42acdfblb5al7427d301'), 'nombre' : 'ruben', 'apellido' : 'gomez' >

Question No: 12

MultipleChoice

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 > > ] > )

Options

A{''_ _id' : 3, 'a' : 4, 'c' : 0, 'b' : 14}

B{''_ Jd' : 7, 'a' : 8, 'c' : 1, 'b' : 7}

C{'. Jd' : 6, 'a' : 1, 'c' : 1, 'b' : 5}

D{ ''\ Jd' : 9, 'a' : 17, 'c' : 1, 'b' : 1}

E{ \ Jd' : 10,'a' : 3, 'c' : 1, 'b' : 1}

F{'. Jd' : : 2, 'a' : 2, 'c' : : 0, 'b' : 1}

G{'. Jd' : : 4, 'a' : 5, 'c' : : 0, 'b' : 17}

H{'. Jd' : : 1, 'a' : 0, 'c' : : 0, 'b' : 2}

I{'. Jd' : : 5, 'a' : 3, 'c' : : 0, 'b' : 12}

J{'. Jd' : : 8, 'a' : 11, 'c' : 1, 'b' : 0}

Question No: 13

MultipleChoice

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)

Options

AORS1

BORS2

CORS3

DO arbiter

ERSO

Question No: 14

MultipleChoice

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 ] >

Options

Adb.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )

Bdb.c.find( { b : [ 0 , 5 ] > )

Cdb.c.find( { > , { b : { $substr[ 0 , 5 ] > > )

Ddb.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )

Edb.c.find( { > , { b : [ 0 , 5 ] > )

Free MongoDB C100DBA Exam Dumps June 2026