UUID v7: Time-Ordered UUIDs for Better Database Performance
Explore UUID v7, the new time-ordered format that improves database indexing. Compare with v4 and ULID for distributed system identifiers.
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Tags: developer-tools, uuid, v7
UUID v7: Time-Ordered UUIDs for Better Database Performance UUID v4 is random by design. That randomness is excellent for privacy and collision avoidance, but terrible for database B-tree indexes: every insert lands at a random position in the index tree, causing constant page splits and poor cache utilization. UUID v7 solves this by embedding a millisecond-precision Unix timestamp at the front of the UUID, making new UUIDs naturally sort to the end of the index — just like auto-increment integers, but with the global uniqueness of a UUID. --- The Problem with Random UUIDs in Databases B-tree indexes — the structure behind almost every relational database primary key index — work best when new values are inserted at the end (monotonically increasing). Auto-increment integers are the ideal…
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