Document size limits and structure rules in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the maximum size allowed for a single MongoDB document?

A single MongoDB document can be up to 16 megabytes (MB) in size.

beginner

Can a MongoDB document contain nested documents and arrays?

Yes, MongoDB documents can contain nested documents and arrays, allowing complex data structures within a single document.

intermediate

Why should you avoid very large documents in MongoDB?

Very large documents can slow down read and write operations and may cause performance issues. It's better to design documents to be reasonably sized.

beginner

What happens if you try to insert a document larger than 16MB in MongoDB?

MongoDB will reject the insert or update operation and return an error because the document exceeds the maximum allowed size.

intermediate

Are there any restrictions on the types of fields or keys in a MongoDB document?

Field names cannot contain the null character (\0) and should not start with '$' or contain '.' characters to avoid conflicts with MongoDB operators and queries.

What is the maximum size of a MongoDB document?

A 512 KB

B 16 MB

C 1 GB

D 100 MB

MongoDB limits each document to a maximum size of 16 megabytes.

Which of the following is NOT allowed in MongoDB field names?

A Field names containing null character (\0)

B Field names starting with '$'

C Field names with spaces

D Field names containing '.'

Field names cannot contain the null character (\0). Starting with '$' or containing '.' is also restricted but spaces are allowed.

What happens if you insert a document larger than 16MB in MongoDB?

A MongoDB compresses the document

B The document is automatically split

C The insert operation fails with an error

D The document is truncated

MongoDB rejects documents larger than 16MB and returns an error.

Can MongoDB documents contain arrays and nested documents?

A Neither are allowed

B Only arrays are allowed

C Only nested documents are allowed

D Yes, both are allowed

MongoDB supports complex documents with nested documents and arrays.

Why should you avoid very large documents in MongoDB?

A They slow down database operations

B They cause syntax errors

C They are automatically deleted

D They increase storage costs only

Large documents can slow down read and write operations, affecting performance.

Explain the size limit for MongoDB documents and why it matters.

Think about how big a document can be and what happens if it is too big.

Describe the rules for field names in MongoDB documents.

Consider special characters and reserved symbols.