Database Indexes

Lesson in the Backend Developer Roadmap · Stage 21: Scaling Databases

Last updated 14 September 2026

What is Database Indexes?

Database indexes are data structures that speed up data retrieval by creating references to table data without full table scans. Include B-tree, bitmap, and hash types. Enhance query performance but increase storage requirements and slow down writes due to index maintenance.

Study this in the interactive course See the whole Backend roadmap

Free resources to learn Database Indexes

Official docsPostgreSQL - Indexes
ArticleWhat is a Database Index?
ArticleUse the Index, Luke! - A Guide to Database Performance for Developers
VideoDatabase Indexing Explained

Database Indexes: common questions

Can I learn Database Indexes in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Database Indexes in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Database Indexes tutorial for beginners?

It is lesson 127 of 155 in the free Backend roadmap, in stage 21, Scaling Databases. If you are new to Backend, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.