1  –  parameter

    Specifies the character set used for the default, identifier,
    and literal character set for the session. The value of runtime-
    options must be a valid character set. See the Oracle Rdb SQL
    Reference Manual for a list of allowable character sets and
    option values.

2  –  parameter-marker

    Specifies the character set used for the default, identifier,
    and literal character set for the session. The value of runtime-
    options must be a valid character set. See the Oracle Rdb SQL
    Reference Manual for a list of allowable character sets and
    option values.

3  –  'string-literal'

    Specifies the character set used for the default, identifier,
    and literal character set for the session. The value of runtime-
    options must be a valid character set. See the Oracle Rdb SQL
    Reference Manual for a list of allowable character sets and
    option values.