UUID v4 Demystified: How Cryptographic GUIDs Work and Why Collision is Impossible
Everything you need to know about 128-bit RFC 4122 Universally Unique Identifiers (UUIDs). Learn why database engineers prefer UUID v4 over auto-incrementing integer IDs.
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Why Sequential IDs Hurt Modern Systems
Traditional `AUTO_INCREMENT` integer IDs in relational databases leak company transaction volumes to competitors and cause primary-key collisions during database sharding.UUID v4 provides $2^{122}$ possible random combinations. You would need to generate 1 billion UUIDs per second for 85 years to reach a 50% probability of a single collision.
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