UUID v4 vs. UUID v7: Time-Ordered Identifiers for Database Indexing

Why random UUIDs cause B-Tree index fragmentation and how UUID v7 solves the problem.

Published by EvriTool Editorial Team • Reading Time: 7 min read • Public Reference Guide (No Login Required)

Random Entropy and B-Tree Degradation

UUID v4 distributes keys randomly across disk pages, causing frequent page splits and slow writes.

Embedding a 48-bit Unix timestamp at the start of the UUID ensures sequential database inserts.

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