Oracle 9i SYS_CONTEXT函数的使用方法

        INSTANCE
        The instance identification number of the current instance.

        IP_ADDRESS
        IP address of the machine from which the client is connected.

        ISDBA
        TRUE if you are logged on as SYS.

        LANG
        The ISO abbreviation for the language name, a shorter form than the existing 'LANGUAGE' parameter.

        LANGUAGE
        The language and territory currently used by your session, along with the database character set, in the form:language_territory.characterset.

        NETWORK_PROTOCOL
        Network protocol being used for communication, as specified in the 'PROTOCOL=protocol' portion of the connect string.

        NLS_CALENDAR
        The current calendar of the current session.

        NLS_CURRENCY
        The currency of the current session.

        NLS_DATE_FORMAT
        The date format for the session.

        NLS_DATE_LANGUAGE
        The language used for expressing dates.

        NLS_SORT BINARY
        or the linguistic sort basis.

        NLS_TERRITORY
        The territory of the current session.

        OS_USER
        Operating system username of the client process that initiated the database session.

        PROXY_USER
        Name of the database user who opened the current session on behalf of SESSION_USER.

        PROXY_USERID
        Identifier of the database user who opened the current session on behalf of SESSION_USER.

        SESSION_USER
        Database user name by which the current user is authenticated. This value remains the same throughout the duration of the session.

        SESSION_USERID
        Identifier of the database user name by which the current user is authenticated.

        SESSIONID
        The auditing session identifier. You cannot use this option in distributed SQL statements.

        TERMINAL
        The operating system identifier for the client of the current session. In distributed SQL statements, this option returns the identifier for your local session. In a distributed environment, this is supported only for remote SELECT statements, not for remote INSERT, UPDATE, or DELETE operations.