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New UUID Formats (www.ietf.org)

submitted 4 months ago by agilob@programming.dev to c/programming@programming.dev

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This document presents new time-based UUID formats which are suited for use as a database key.

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[–] Ephera@lemmy.ml 4 points 4 months ago

For others wondering what's wrong with UUIDv4:

UUID versions that are not time ordered, such as UUIDv4, have poor database-index locality. This means that new values created in succession are not close to each other in the index; thus, they require inserts to be performed at random locations. The resulting negative performance effects on the common structures used for this (B-tree and its variants) can be dramatic.

I guess, this means with these new UUIDs, ideally you only create UUIDs on systems that are hooked up to NTP, though I guess, it won't really be worse than UUIDv4 either way.