How MongoDB stores data as documents - Quick Revision & Summary

Recall & Review

beginner

What is the basic unit of data storage in MongoDB?

The basic unit of data storage in MongoDB is a document. Documents are similar to JSON objects and store data in key-value pairs.

beginner

How are MongoDB documents structured?

MongoDB documents are structured as BSON (Binary JSON), which allows them to store complex data types like arrays and nested documents.

intermediate

Can MongoDB documents have different fields in the same collection?

Yes, MongoDB is schema-less, so documents in the same collection can have different fields and structures.

beginner

What data types can be stored inside a MongoDB document?

MongoDB documents can store various data types including strings, numbers, dates, arrays, embedded documents, and binary data.

intermediate

Why does MongoDB use BSON instead of plain JSON for documents?

BSON is a binary format that is faster to parse and supports additional data types like date and binary which JSON does not support natively.

What format does MongoDB use to store documents internally?

A YAML

B BSON

C CSV

D XML

MongoDB stores documents internally in BSON format, which is a binary form of JSON.

Can documents in the same MongoDB collection have different fields?

A No, all documents must have the same fields

B Only if they are in different databases

C Yes, MongoDB collections are schema-less

D Only if they are indexed

MongoDB collections are schema-less, so documents can have different fields and structures.

Which of the following is NOT a valid data type in a MongoDB document?

A Array

B Date

C Embedded document

D Function

MongoDB documents do not store functions as data types.

Why is BSON preferred over JSON in MongoDB?

A BSON supports more data types and is faster to parse

B BSON is human-readable

C BSON is text-based

D BSON files are smaller than JSON files

BSON supports additional data types and is optimized for speed, unlike JSON.

What does a MongoDB document resemble in everyday terms?

A A JSON object

B A spreadsheet row

C A flat text file

D A relational table

A MongoDB document resembles a JSON object with key-value pairs.

Explain how MongoDB stores data as documents and why this is useful.

Think about how documents are like JSON and how MongoDB allows different structures.

Describe the advantages of using BSON for storing MongoDB documents compared to plain JSON.

Consider what extra features BSON has that JSON lacks.