Users require a password to connect to the database instance (start a database session).
<password> ::= <identifier> | <first_password_character>[<identifier_tail_character>...]
identifier, identifier_tail_character
<first_password_character> ::= <letter> | <extended_letter> | <language_specific_letter> | <digit>
letter, extended_letter, language_specific_letter, digit
Passwords are truncated after 18 characters.