Are your MongoDB queries running slow? You need to learn about indexes! An index is a special data structure that dramatically speeds up read operations by helping MongoDB find your data without scanning every single document.

What you will learn:

What an Index Is: A simple explanation of how indexes work (like an index in a book).

Why Indexes Matter: See the performance difference between a query with an index and one without (using explain("executionStats")).

db.collection.createIndex(): The main command to create an index.

Single-Field Index: How to create an index on a single field (e.g., db.users.createIndex({ email: 1 })).

Compound Index: How to create an index on multiple fields for more complex queries (e.g., db.users.createIndex({ city: 1, age: -1 })).

How to see and delete existing indexes (getIndexes(), dropIndex()).

If you want your application to be fast and scalable, understanding indexes is not optional!

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