Lars Bergeson <larsavatar(at)gmail(dot)com> writes:
> I'm running PostgreSQL under AWS Aurora, and I didn't set it up or install
> it, so I'm not sure about the OS version.
Oh! Aurora is not Postgres. My admittedly-not-well-informed
understanding is that they stuck a Postgres front end on their
existing storage engine, so it's not surprising if storage-level
behaviors are quite different from stock Postgres.
regards, tom lane