How Database Indexes Actually Work — From the Disk Up

📰 Dev.to · Elvis

Learn how database indexes work from disk storage to query optimization and why it matters for database performance

intermediate Published 24 Jun 2026
Action Steps
  1. Explore the physical storage of indexes on disk to understand how data is retrieved
  2. Analyze the trade-offs between different indexing strategies, such as B-tree and hash indexes
  3. Configure and test indexing techniques to optimize query performance in a database
  4. Compare the effects of indexing on query execution plans and database throughput
  5. Apply indexing best practices to improve data retrieval efficiency in a real-world database scenario
Who Needs to Know This

Database administrators, software engineers, and data scientists can benefit from understanding how indexes work to optimize database queries and improve application performance

Key Insight

💡 Indexes are a crucial optimization technique that can significantly improve database query performance, but require careful consideration of trade-offs

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Key Takeaways

Learn how database indexes work from disk storage to query optimization and why it matters for database performance

Full Article

Every index is a different answer to the same trade-off. A while ago I gave a talk to my engineering...
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