Option          Access Constraints

    SHARED          Other users can work with the same relations
                    as you.  Depending on the option they choose,
                    they can have read-only or read and write
                    access to the relations.

    PROTECTED       Other users can read the relations you are
                    using. They cannot have WRITE access.

    EXCLUSIVE       Other users cannot read records from the
                    relations included in your transaction.  If
                    another user refers to the same relation in
                    a START_TRANSACTION statement, Oracle Rdb denies
                    access to that user.

    READ            You will only read data from the relations.

    WRITE           You will store, modify, or erase data in
                    the relations.