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Which of the following describes how the .sort() method is used? (Select one.)

To return a cursor that points to the documents that match a query.

To specify the maximum number of results that we want to return.

To specify the fields to sort by and the direction of the sort: 1 for ascending or -1 for descending.

✅

To find one document in a collection.

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What is a multikey index? (Select one.)

An index where one of the indexed fields contains an array

An index on more than one field where multiple fields are arrays

❌

An index on one field only where the field is not an array

An index on more than one field where none of the fields are arrays

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What

happens if you set the $o

stage to output to a

collection that already exists?

A new database with the specified name of the

collection is created.

The existing

collection is erased and replaced with the outputted documents.

An error is returned, and the existing collection is

not modified.

A second collection with "_1" appended to

the name is created.

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You have a collection

that contains zip codes in the United States. Here’s a sample document from

this collection:

What will the output of

this aggregation pipeline be?

One document for each zip code located in

California (CA)

One

document for each city located in California (CA)

❌

All

documents that contain a zip where the state is California (CA)

The total

number of documents that contain a zip code in the state of California (CA)

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What method appends element to the array if this element doesn't exist already?

What method does instruct the server to avoid closing a cursor automatically after a period of inactivity? (Select one)

cursor.readPref()

cursor.readConcern()

cursor.pretty()

cursor.objsLeftInBatch()

cursor.noCursorTimeout()

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In mongosh, when you assign the cursor returned from the find() method to a variable using the var keyword, the cursor does not automatically iterate.

What is the purpose of the $lookup stage in MongoDB aggregation framework?

To group and summarize data from multiple documents

To join data from multiple collections

To convert data into a graph

To store data in a flat file

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Which command returns all of the documents in the customers collection?:

db.find().customers();

In MongoDB, x.509 certificates can be used to enable:

internal authentication

2-factor authentication

TLS encryption

SCRAM

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