Ready to take your MongoDB skills to the next level? While basic indexes are great, specialized indexes are what truly power high-performance, real-world applications. In this essential 2025 guide, we dive deep into the three most important index types you need to know: Compound, Unique, and Text Indexes.

This tutorial is perfect for developers who need to enforce data integrity, optimize complex search queries, or speed up multi-field filtering. We provide the exact syntax for each and explain the "rules of the road" to avoid common pitfalls.

What you will learn in this video:

Compound Indexes: Why index one field when you can index three?

Learn the syntax: db.collection.createIndex({ field1: 1, field2: -1 }).

Understand the Prefix Rule: Why an index on { a, b, c } also speeds up queries on just { a } or { a, b }.

Mastering the ESR Rule (Equality, Sort, Range) for maximum efficiency.

Unique Indexes: Enforce data integrity at the database level!

How to prevent duplicate emails or usernames using { unique: true }.

Creating Unique Compound Indexes to ensure a specific combination of fields (like firstName + lastName) is never repeated.

Handling "Missing Fields": Learn why MongoDB treats a missing field as null and how it affects uniqueness.

Text Indexes: Power your own search engine!

Syntax: db.collection.createIndex({ content: "text" }).

How to perform full-text searches using the $text and $search operators.

Weights & Wildcards: Assigning importance to specific fields or indexing every string field in a document using "$**": "text".

Important Restriction: Remember, a collection can only have one text index!

Why These Matter:

Compound indexes reduce the number of indexes you need to manage.

Unique indexes stop "garbage data" from entering your collection.

Text indexes allow for sophisticated word-based searches that a regular index just can't handle.

By the end of this tutorial, you’ll be able to architect a robust indexing strategy that keeps your data clean and your searches lightning-fast!

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