[atombender]

They show that they're storing the ULIDs as text. Quoting from the article:

   CREATE TABLE ulid_test(id TEXT);

I suspect their poor results come from their choice of ULID implementation. The native C implementation I tried out is faster than the Postgres UUID type when testing computation only.

I noticed a bug in their test: They call generate_ulid() with now(). But now() is an alias for transaction_timestamp(), which is computed once at the start of the transaction, so all the timestamps will be the same. They should be using clock_timestamp().

[sgarland]

Good catch to both.