In this video I whiteboard how UUIDs hurt write (and read performance) when used on secondary and primary indexes. UUIDv4 are the most popular but they are truly random. Compared to snowflakes, ULID or UUIDv7 or even UUIDv1.

0:00 UUIDv4
2:30 B+Tree Indexes and UUID
5:30 Random UUIDv4 Insert Workload
12:40 Ordered Insert Workload (UUID7/ULID, Sequence)
14:00 Shared buffer pool flushes
15:00 Shopify ULID use case
17:00 URL shortner UUIDs?


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