UUID v7 vs v4: PostgreSQL Performance Benchmark

📰 Dev.to · Iurii Rogulia

Learn how UUID v7 improves PostgreSQL performance by reducing B-tree index fragmentation compared to UUID v4, and how to migrate using Drizzle ORM

intermediate Published 29 May 2026
Action Steps
  1. Run a benchmark to compare the performance of UUID v7 and v4 in PostgreSQL using a dataset of 5M rows
  2. Configure your PostgreSQL database to use UUID v7 instead of v4 to reduce B-tree index fragmentation
  3. Test the impact of UUID v7 on query performance and index maintenance
  4. Apply the Drizzle ORM migration steps to update your application to use UUID v7
  5. Compare the performance of your application before and after migrating to UUID v7
Who Needs to Know This

Database administrators and developers who work with PostgreSQL and UUIDs can benefit from understanding the performance differences between UUID v7 and v4, and how to implement UUID v7 in their applications

Key Insight

💡 UUID v7 reduces B-tree index fragmentation, leading to improved query performance and reduced index maintenance

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🚀 Improve PostgreSQL performance by switching from UUID v4 to v7! 📊

Full Article

UUID v7 vs v4 in PostgreSQL: why random UUIDs fragment B-tree indexes, how UUID v7 fixes it, benchmarks at 5M rows, and Drizzle ORM migration steps.
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