C100DBA Exam Dumps - MongoDB Associate Database Administrator(Based on MongoDB 6.0 and 7.0+)

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Question # 25

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 " ;-!});

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Question # 26

As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

Providing these parameters in any order does not impact the performance

$sort moves before $match

MongoDB does not do any movements by default and will use the order provided

$match moves before $sort

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Question # 27

Which format/standard is used by MongoDB internally to store documents?

JSON

BSON

B+ Trees

JSON - Extended

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Question # 28

Which node in a replica set does accept write operation?

arbiter

hidden

primary

secondary

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Question # 29

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.

Skips the first five documents and returns the next five

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

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

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Question # 30

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?

db.posts.find({author: " Tom " Â».limit({tags:2})

db.posts.find({author: " Tom " Â».limit($slice:{tags:2 > )

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.

db.posts.find({author: " Tom " > ,{tags:{$slice:2Â»)

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Question # 31

Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

$aggregate

$sum

$match

$group

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Question # 32

Which of the following does MongoDB use to provide High Scalability?

Replication

Write Concern

Indexing

Sharding

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