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Data Formats

UUIDv4 vs UUIDv7 vs ULID: Why Random Primary Keys Hurt Your Index

Random UUIDv4 keys scatter inserts across your B-tree. Here is how UUIDv7 and ULID put a timestamp up front to fix it, with bit layouts, a worked decode and when v4 still wins.

November 11, 2026 · 9 min read

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