Using UUIDv4 as primary key has unexpected downsides because data locality matters in surprising places [1].
A UUIDv7 primary key seems to reduce / eliminate those problems.
If there is also an indexed UUIDv4 column for external id, I suspect it would not be used as often as the primary key index so would not cancel out the performance improvements of UUIDv7.
A UUIDv7 primary key seems to reduce / eliminate those problems.
If there is also an indexed UUIDv4 column for external id, I suspect it would not be used as often as the primary key index so would not cancel out the performance improvements of UUIDv7.
[1] https://www.cybertec-postgresql.com/en/unexpected-downsides-...