Pretty printing and cursor behavior in MongoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the pretty() method do in MongoDB?

The pretty() method formats the output of a query to be easier to read by adding indentation and line breaks.

beginner

How does a MongoDB cursor behave when you run a query?

A cursor points to the result set of a query and allows you to iterate over the documents one by one instead of loading all at once.

beginner

What happens if you do not use pretty() on a MongoDB query result?

The output will be shown in a compact JSON format without extra spaces or line breaks, which can be harder to read.

intermediate

How can you retrieve the next document from a MongoDB cursor?

You can use the next() method on the cursor to get the next document in the result set.

intermediate

Why is using a cursor beneficial when working with large datasets in MongoDB?

Because a cursor fetches documents in batches and lets you process them one at a time, it saves memory and improves performance.

What does the pretty() method do in MongoDB?

A Creates a new collection

B Deletes documents from the collection

C Formats query output to be more readable

D Updates documents in the collection

The pretty() method formats the output to add indentation and line breaks for easier reading.

What is a MongoDB cursor?

A A command to delete documents

B A pointer to the result set of a query

C A method to format output

D A type of database index

A cursor points to the query results and allows you to iterate over documents one by one.

Which method retrieves the next document from a MongoDB cursor?

A find()

B insert()

C pretty()

D next()

The next() method returns the next document from the cursor.

What happens if you do not use pretty() on a query result?

A Output is compact JSON without extra spaces

B Query results are deleted

C Cursor is closed automatically

D Output is saved to a file

Without pretty(), the output is shown in compact JSON format which is harder to read.

Why is using a cursor helpful for large datasets?

A It fetches documents in batches to save memory

B It deletes documents faster

C It formats output automatically

D It creates indexes on the fly

Cursors fetch documents in batches, allowing efficient processing without loading all data at once.

Explain how the pretty() method changes the output of a MongoDB query and why it might be useful.

Think about how JSON looks with and without extra spaces.

Describe what a MongoDB cursor is and how it helps when working with query results.

Imagine reading a book page by page instead of all at once.