CHANGE DEFAULT PASSWORDS FOR ALL USERS
The default account SCOTT no longer installs with the default password TIGER.
The account is now locked and expired upon install. All other accounts installed
with a default password that is the same as the user account. If any of these
accounts is unlocked, assign a new stronger password. Starting with Oracle
Database 11g security administrators can easily check for default passwords by
using the new database view DBA_USERS_WITH_DEF_PWD..