Vacuum DB in Postgres Vs similar concept in other RDBMS

Hi,

I was wondering if Vacuum DB concept in Postgres is really novel and there's no concept like this in other RDBMS like oracle or sql server.
If at all other RDBMS have such a concept implemented, how good or bad it is as compared to postgres's vacuum db concept.

Any type of pointers would be highly appreciated.

Thanks,
~Harpreet