VMS Help  —  RMU72  Backup  After Journal, Command Qualifiers, Quiet Point
    Quiet_Point
    Noquiet_Point

    Specifies whether the quiet-point lock will be acquired when an
    .aij backup operation is performed. The default is the Quiet_
    Point qualifier. Use of the Quiet_Point qualifier is meaningful
    only for a full backup operation; that is, a backup operation
    that makes a complete pass through all .aij files ready for
    backup as opposed to one which is done by-sequence (specified
    with the Sequence qualifier). A full .aij backup operation can
    be performed regardless of whether an extensible or a fixed-size
    .aij journaling mechanism is being employed.

    Each .aij backup operation is assigned an .aij sequence number.
    This labeling distinguishes each .aij backup file from previous
    .aij backup files. During a recovery operation, it is important
    to apply the .aij backup files in the proper sequence. The RMU
    Recover command checks the database root file structure and
    displays a message telling you the .aij sequence number with
    which to begin the recovery operation.

    The quiet point is a state where all write transactions
    have either been committed or rolled back and no read/write
    transactions are in progress. This ensures that the recording
    of transactions do not extend into a subsequent .aij backup file.
    This backup file can then be used to produce a recovered database
    that is in the same state as when the quiet point was reached.

    When fixed-size journaling is employed, the Quiet_Point qualifier
    is only relevant when the active .aij file is being backed up. In
    this case, a quiet point is acquired only once, regardless of the
    number of .aij files being backed up.

    There is no natural quiet point if someone is writing or waiting
    to write to the database at any given time. (A natural quiet
    point is one that is not instigated by the use of the QP (quiet
    point) Lock.) The .aij backup operation may never be able to
    capture a state that does not have uncommitted data in the
    database. As a result, the Noquiet_Point qualifier creates .aij
    backup files that are not independent of one another. If you
    apply one .aij backup file to the database without applying the
    next .aij backup file in sequence, the recovery operation will
    not be applied completely.

    See the Usage_Notes help entry under this command for
    recommendations on using the Quiet_Point and Noquiet_Point
    qualifiers.

    The following combination of qualifiers on the same command line
    are invalid:

    o  Quiet_Point and Sequence

    o  Quiet_Point and Wait

    o  Noquiet_Point and Format=New
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