Question: We all have our favourite database. If you look objectively at your chosen database, what drawbacks does it have and what could be improved?

The rules:

* One reply per drawback with;
* a short description of the limitation, followed by;
* a more detailed description, an explanation of how it could be done better or an example of another technology that does not have the same limitation.
* Do not diss any database that you haven't used extensively. It is easy to take potshots at other technologies but we want to learn form your experience, not your prejudice.

Answer: 
I love the flexibility of sequences in Oracle as compared with other databases autoincrements, but the inability to set seq.nextval as a default for a pk column is somewhat annoying, and must be trivial to fix.
PostgreSQL doesn't have a good failover solution, but I understand they're working on it.