Password 

Users require a password (password) to connect to the database instance (start a database session).

Syntax

<password> ::= <identifier>
             | <first_password_character>[<identifier_tail_character>...]

<first_password_character>  ::= <digit>
                              | <letter>
                              | <extended_letter>
                              | <language_specific_character>

<digit>                     ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

<letter>                    ::= A | B | C | D | E | F | G | H | I | J
                              | K | L | M | N | O | P | Q | R | S | T
                              | U | V | W | X | Y | Z
                              | a | b | c | d | e | f | g | h | i | j
                              | k | l | m | n | o | p | q | r | s | t
                              | u | v | w | x | y | z

<extended_letter>           ::= # | @ | $

<identifier_tail_character> ::= <digit>
                              | <letter>
                              | <extended_letter>
                              | <language_specific_character>
                              | <underscore>

<underscore> ::= _

Explanation

Passwords are truncated after 18 characters.

Language-Specific Characters

A language-specific character language_specific_character is any letter that occurs in a northern, southern, or central European language and is not contained in the list of letters.

German umlauts: ä, ö, ü

French letters with a “grave” accent: à

If you have installed a UNICODE-enabled database instance, a language-specific character is a character that is not included in the ASCII code list from 0 to 127.

See also:

CREATE USER Statement (create_user_statement)

ALTER PASSWORD Statement (alter_password_statement)

Concepts of the Database System, Conventions for User Names and Passwords