Disable Oracle's password expiry (11g)

 Unlike older releases, Oracle 11g sets password expiry by default. That's really annoying

• for SYS and SYSTEM: nobody wants to regularly change (and forget) them.
• for any accounts that are used by application servers: the password is usually configured in a data source file, nobody would ever want to change it
• if some superusers directly access the DB and keep forgetting the password, the automatic locking will lock your application out: not great for your up time.

So let's get rid of these annoyances with:

ALTER PROFILE DEFAULT LIMIT
  FAILED_LOGIN_ATTEMPTS UNLIMITED
  PASSWORD_LIFE_TIME UNLIMITED;

And also let's turn off the default auditing:

NOAUDIT ALL;
DELETE FROM SYS.AUD$;