UUID V7 Generator

UUID MAX
UUID NIL
UUID V1 BULK
UUID V1
UUID V4 BULK
UUID V4
UUID V7 BULK
UUID V7
Technical Documentation & FAQ

UUID v7: The Modern Database Powerhouse

  • Section A: The Technical Deep Dive UUID v7 is the next generation of identifiers, recently formalized in RFC 9562. It solves the 'Randomness Problem' found in v4. While v4 is great for security, its randomness destroys database performance by causing 'index fragmentation.' UUID v7 is time-ordered. It combines a 48-bit Unix timestamp (in milliseconds) with 74 bits of randomness. This allows the IDs to be lexicographically sortable, meaning IDs generated later will always be 'greater' than those generated earlier. This allows databases to append new records to the end of a B-Tree index rather than inserting them into random spots, resulting in significantly faster write speeds.

  • Section B: Performance Use Cases

    • SQL Primary Keys: If you use PostgreSQL, MySQL, or SQL Server, v7 is the superior choice for primary keys. It gives you the uniqueness of a UUID with the performance of a sequential integer.

    • Time-Series Tracking: v7 allows you to sort records by their creation time using only the ID, without needing a separate created_at column.

    • Distributed Event Logging: Ensures that logs from different servers can be merged and sorted chronologically with microsecond precision.

  • Section C: The Sorting Advantage Because the most significant bits of a v7 UUID represent time, these identifiers work perfectly with standard string sorting. In a high-concurrency environment, if multiple IDs are generated within the same millisecond, the 74 bits of random data (and an optional sequence counter) ensure uniqueness and maintain a stable sort order.

  • Section D: Developer FAQ

    • Q: Can I replace v4 with v7? A: In almost all cases, yes. v7 offers the same 128-bit footprint but provides better database ergonomics.

    • Q: Does v7 leak my identity? A: It reveals the time of generation, but unlike v1, it does not reveal your MAC address or hardware identity, making it a safe middle ground between v1 and v4.