MongoDB Test 2

Question 1

Which mode does the explain() command operate in by default?

Accepted Answer

queryPlanner

Answer

customExecutionStats

Answer

executionStats

Answer

allPlansExecution

Question 2

The master's oplog uses the ____ storage size measure .

Accepted Answer

MB

Answer

Byte

Answer

GB

Answer

KB

Question 3

The $inc key modifier acts with the _____ data type.

Accepted Answer

numeric

Answer

string

Answer

array

Answer

character

Question 4

$push is an array operator that adds a key to an array at the ______.

Accepted Answer

End

Answer

As per key value

Answer

Start

Answer

Specified position

Question 5

Which of the following commands has the potential to lock the database?

Accepted Answer

All of the above

Answer

Map-reduce

Answer

Issuing a query

Answer

Inserting data

Question 6

Which of the following statements concerning sharding is correct?

Accepted Answer

Once a shard key is put up, we can't alter it directly or automatically.

Answer

When you create a sharded key, it also builds an index on the collection that uses that key.

Answer

Because the documents are spread across multiple mongod instances, sorting is not possible in a sharded environment.

Answer

Sharding is enabled at the database level

Question 7

What is the largest Index Key Limit and Number of Indexes per collection?

Accepted Answer

1024 bytes and 64 indexes

Answer

1024 bytes and unlimited indexes

Answer

64 bytes and 1024 indexes

Answer

12 mega bytes and 64 indexes

Question 8

What is the maximum document size in MongoDB?

Accepted Answer

16MB

Answer

12MB

Answer

8MB

Answer

2MB

Question 9

The mongoimport command is used to do the:

Accepted Answer

imports content from an Extended JSON, CSV, or TSV export created by mongoexport

Answer

import all the MongoDB data from one format to another

Answer

import all the data from one database to another

Answer

import all the data from one collection to another