C100DBA Exam Dumps Pass with Updated May-2023 Tests Dumps [Q39-Q56]

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C100DBA Exam Dumps Pass with Updated May-2023 Tests Dumps

C100DBA exam questions for practice in 2023 Updated 123 Questions

The MongoDB C100DBA certification exam is an excellent way for individuals to validate their MongoDB administration skills and demonstrate their commitment to excellence. By passing the exam, candidates can gain recognition and differentiate themselves in a competitive job market.

Achieving the MongoDB Certified DBA Associate certification demonstrates that a candidate has the skills and knowledge required to manage MongoDB deployments. The certification is recognized globally and is a valuable credential for professionals seeking career advancement in the field of database administration. Certified professionals are also eligible to join the MongoDB Certified Professionals LinkedIn group, where they can connect with other certified professionals and access exclusive resources.

Q39. In a replicated cluster, which of the following node would only be used during an election?

arbiter

primary

hidden

secondary

Q40. 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

Q41. 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 > )

Q42. Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:”ruben”,apellido:”gomez”},{nombre:l,apellido:l,aficion:l});

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

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

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

{ “_id” : Objectld(“580a42acdfblb5al7427d301”), “nombre” : “ruben”, “apellido” : “gomez” >

Q43. What does the following aggregate query perform?

Fetches the posts with likes between 100 and 200 and sets their _id as null

Groups the posts by number of likes (101, 102, 103.) by adding 1 every time

Calculates the number of posts with likes between 100 and 200

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

Q44. 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.

db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )

db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )

db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )

db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )

Q45. You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

db.stopBalancer()

db.stopserver()

sh.stopBalancer()

sh.stopserverQ

Q46. Update If Correct is an approach for which of the following concepts in MongoDB:

Concurrency Control

Atomicity

Performance Management

Transaction Management

Q47. Consider the following documents:

You perform the following query;

How many documents will be updated by the query?

Q48. Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

$arrayLimit

$push along with $each, $sort and $slice

$removeFromSet

None of the above

Q49. Consider the following document from the products collection:

What does the following query using $elemMatch return? db.products.find( { product_code: “345678” }, { variations: { $elemMatch: { size: ^L^ } } } )

Returns the complete document but retrieves only the size field from the array

Returns the document but with only one element in the variations array (corresponding to size L)

Returns the complete document since MongoDB does not support partial array retrieval

Returns the complete document but retrieves only the size field from the array and also with only one element in the variations array (corresponding to size L)

Q50. 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

Q51. 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({commerits.$.author”:-l});

db.posts.createIndex({comments.$.author”: {$desc:l>});

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

Q52. You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?

MinKey, Null, Numbers,Symbol, String,Object,Array,BinData

MinKey, Null, Numbers,Object,Array,BinData,Symbol, String

Object/Array^inData/Symbol,MinKey, Null, Numbers,String

Objec^Array^inData,Symbol, String,MinKey, Null, Numbers

Q53. Which of the following aggregation commands in MongoDB does not support sharded collections?

mapReduce

group

aggregate

All of the above

Q54. What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?

secondaryPreferred

Secondary

nearest

primary

primaryPreferred

Q55. To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

update users collection and restart mongodb

All of the above

update users collection and restart mongodb with -auth option

update users collection and run db.enableAuthenticationQ

Q56. Which of the following is true about sharding?

Creating a sharded key automatically creates an index on the collection using that key

We cannot change a shard key directly/automatically once it is set up

A sharded environment does not support sorting functionality since the documents lie on various mongod instances

Sharding is enabled at the database level

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