Tape_Expiration=date-time

    Specifies the expiration date of the .aij backup file. Note that
    when Oracle RMU reads a tape, it looks at the expiration date
    in the file header of the first file on the tape and assumes
    the date it finds in that file header is the expiration date
    for the entire tape. Therefore, if you are backing up an .aij
    file to tape, specifying the Tape_Expiration qualifier only has
    meaning if the .aij file is the first file on the tape. You can
    guarantee that the .aij file will be the first file on the tape
    by specifying the Rewind qualifier and overwriting any existing
    files on the tape.

    When the first file on the tape contains an expiration date
    in the file header, you cannot overwrite the tape before the
    expiration date unless you have the OpenVMS SYSPRV or BYPASS
    privilege.

    Similarly, when you attempt to perform a recover operation with
    an .aij file on tape, you cannot perform the recover operation
    after the expiration date recorded in the first file on the tape
    unless you have the OpenVMS SYSPRV or BYPASS privilege

    By default, no expiration date is written to the .aij file
    header. In this case, if the .aij file is the first file on the
    tape, the tape can be overwritten immediately. If the .aij file
    is not the first file on the tape, the ability to overwrite the
    tape is determined by the expiration date in the file header of
    the first file on the tape.

    You cannot explicitly set a tape expiration date for an entire
    volume. The volume expiration date is always determined by
    the expiration date of the first file on the tape. The Tape_
    Expiration qualifier cannot be used with a backup operation to
    disk.

    See the Oracle Rdb Guide to Database Maintenance for information
    on tape label processing.