Crowdly

Add to Chrome

Questions Bank (1401169 total)

How can you update an array field with nested documents in MongoDB?

Using the $addToSet operator with the nested document.

Using the $set operator with the specific nested field.

Using the $[] positional operator with the nested field.

Using the $set operator with the entire updated array.

View this question

What

does the $

out stage do?

Returns all

the documents currently in the aggregation pipeline as one large document.

Removes

documents from the aggregation pipeline.

Creates a new collection that contains the

documents in this stage of the aggregation pipeline.

✅

Removes the

current user who is running the aggregation pipeline from the database.

View this question

When the `new` option is set to `true`, `findAndModify()` returns the updated document.

Replacing a document in MongoDB will keep the original document's `_id` field.

What happens when an index is created in MongoDB?

The indexed fields are encrypted for security.

The indexed fields are compressed to reduce storage space.

Data structures are created to improve query performance on the indexed fields.

The indexed fields are sorted in descending order.

View this question

The Principle of Least Privilege states that:

the user

administrator should have the ability to create other users.

all

users should be restricted to the lowest level of privilege.

users should have the least privilege required

for their intended purpose.

the

database should have limited access to local resources.

View this question

Given a cursor named myCursor, which command returns a boolean value?:

Using the MongoDB shell, how do you remove the customer collection and its indexes?:

db.customers.delete();

db.customers.remove({});

db.customers.drop();

✅

db.customers.remove({}).indexes();

View this question

What is the maximum number of array fields per multikey index? (Select one.)

Unlimited

View this question

What is a compound index? (Select one.)

An index that contains references to multiple fields within a document

✅

An index that supports queries that are run on two collections at the same time

An index that supports queries that combine the field name and the value into one string

An index that supports queries against unknown or arbitrary fields

View this question

Previous
1
134334
134335
134336
134337
134338
140117
Next

Telegram Instagram TikTok Question Bank

Add to Chrome