lexid
ksuid
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lexid
ksuid
- What happens after 100 years?
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Zero Downtime Postgres Upgrades
OP here - we avoid sequences in all but one part of our application due to a dependency. We use [KSUIDs][1] and UUID v4 in various places. This one "gotcha" applies to any sequence, so it's worth calling out as general advice when running a migration like this.
[1]: https://segment.com/blog/a-brief-history-of-the-uuid/
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Bye Sequence, Hello UUIDv7
UUID v4 isn't large enough to prevent collisions, that is why segment.io created https://github.com/segmentio/ksuid which is 160bit vs the 128bit of a UUIDv4.
- You Don't Need UUID
- A Brief History of the UUID
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Type-safe, K-sortable, globally unique identifier inspired by Stripe IDs
Assuming you don't need to use UUIDv7 (or any UUID's) then https://github.com/segmentio/ksuid provides a much bigger keyspace. You could just append a string prefix if you wanted to namespace, but the chance of collisions of a KSUID is many times smaller than a UUID of any version.
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Unexpected downsides of UUID keys in PostgreSQL
KSUID's are have temporal-lexicographical order plus 128 bits of entropy, which is more than UUIDv4.
https://github.com/segmentio/ksuid
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UUIDs are so much better than autoincrementing ids and it's not even close
That's why you use ksuid (https://segment.com/blog/a-brief-history-of-the-uuid/) or, if you're willing to go with a draft spec you could go with the new UUID formats https://www.ietf.org/archive/id/draft-ietf-uuidrev-rfc4122bi...
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What Happened to UUIDv2?
Interesting in more history of UUIDs? Twilio Segment's blog has an amazing history lesson about how they came to be.
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Which UUID package do you use? and why?
I use the ksuid from segment. https://github.com/segmentio/ksuid
What are some alternatives?
ulid-mssql - Implementation of ULID generator For Microsoft SQL Server
ulid - Universally Unique Lexicographically Sortable Identifier (ULID) in Python 3
shortuuid.rb - Convert UUIDs & numbers into space efficient and URL-safe Base62 strings, or any other alphabet.
pg-ulid - ULID Functions for PostgreSQL
Ulid - Fast .NET C# Implementation of ULID for .NET and Unity.
nanoid - A tiny (124 bytes), secure, URL-friendly, unique string ID generator for JavaScript
spec - The Score Specification provides a developer-centric and platform-agnostic Workload specification to improve developer productivity and experience. It eliminates configuration inconsistencies between environments.
spec - The canonical spec for ulid
python-ksuid - A pure-Python KSUID implementation
uuid6-ietf-draft - Next Generation UUID Formats
uuid7 - UUID version 7, which are time-sortable (following the Peabody RFC4122 draft)