MongoDB Tutorial for Beginners (2022) - explain() - Provide Information on the Query Plan

This video tutorial explains how to use the explain method in MongoDB to display query plans, query optimizer details, execution stats, and server information. It demonstrates accessing a demo database, viewing collections, and using the find and pretty methods to format documents in the employee collection. The tutorial concludes with a demonstration of the explain method, highlighting its ability to show query planner and server info.

What is the primary purpose of the explain method in MongoDB?

• To delete documents from a collection

• To display the query plan and optimizer details

• To create a new database

• To update server configurations

Which command is used to enter a specific database in MongoDB?

• use

• enter

• select

• open

How can you format the output of a find method in MongoDB?

• Using the sort method

• Using the pretty method

• Using the filter method

• Using the aggregate method

What information does the explain method provide about a query?

• Only the number of documents in the collection

• Only the query execution time

• Query planner info, server info, and execution stats

• Only the server version

What is the final output of using the explain method in MongoDB?

• A list of all databases

• The plan selected by the query optimizer

• A list of all collections

• The total number of documents in the database