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Chapter 1: How Indexes Work
Last Updated: January 7, 2026
Ashish Pratap Singh
9 min read
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Chapter 1: How Indexes Work
Introduction
The Problem: Full Table Scans
What is an Index?
How Indexes Store Data
Types of Index Lookups
The Write Penalty
Index Selection Strategy
Common Index Types
Index Maintenance
Interview Questions
Summary
References
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Course Introduction
