Understanding UUID v7
A modern, time-ordered identifier designed for high-performance database indexing.
Key Benefits of UUID v7
- Time-sortable for efficient B-tree indexing
- Combines Unix timestamp with randomness
- Reduces database index fragmentation
- Perfect for primary keys in modern DBs
Technical Details
UUID v7 uses a 48-bit Unix timestamp in milliseconds, followed by 74 bits of randomness. It is the new standard for performance-critical systems.
Frequently Asked Questions
Statistically, yes. While not mathematically guaranteed to be unique across all time and space, the probability of generating two identical UUIDs is so small that it's practically impossible in any real-world scenario.
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. For most practical purposes, they are identical and follow the same format.
Yes, especially v4 and v7, which are generated using cryptographically secure random numbers, making them suitable for session IDs and security-sensitive identifiers.