UUID v4 vs UUID v7: Which Unique Identifier Should You Use in 2026?

Published: 2026-02-09 | Read Time: 4 min read

Explore why UUID v7 is replacing UUID v4 in modern database primary keys due to natural Unix millisecond timestamp sorting and B-tree cache efficiency.

Frequently Asked Questions

What is the probability of a UUID v4 collision?

The collision probability is mathematically negligible: you would need to generate 1 billion UUIDs per second for 100 years to have a 50% chance of a single collision.