Example 1

    The following command displays the current .rdb file
    specification of the database:

    RdbALTER> DISPLAY ROOT
             Root file specification is: "DISK1:[RICK.RDB]MF_PERSONNEL.RDB;1"

    This command displays the current database root Unique Identifier
    value.

1  –  Description

    To ensure Oracle Rdb database security and integrity, a Unique
    Identifier has been added to the database root file and the
    database storage area file and storage area snapshot file
    headers. The Unique Identifier in the root file must match the
    Unique Identifier in the storage area file headers or a storage
    area cannot be accessed from the database root.

    The Unique Identifier values are displayed both in VMS date
    format surrounded by quotes and as a hexadecimal number
    surrounded by parentheses. The values displayed are the Unique
    Identifier values for the current RMU/ALTER session. The Unique
    Identifier values will not be written to the root or storage area
    files until the user ends the current session with the RMU/ALTER
    "COMMIT" command. If the user ends the current session with the
    RMU/ALTER "ROLLBACK" command, the Unique Identifier values will
    not be written to the root or storage area files and the Unique
    Identifier values in effect at the start of the session just
    ended will be restored for the new session. Any Unique Identifier
    values that have been changed during the current session will be
    displayed as "(marked)" before they are committed or rolled back.

    To execute the DISPLAY or DEPOSIT ROOT command, the user must
    be attached to the database which the root and areas belong to,
    either by specifying the database name when issuing the RMU/ALTER
    command or by executing the "ATTACH" command from the "RdbALTER>"
    prompt.

2  –  Format

  (B)0DISPLAY ROOT  UNIQUE_IDENTIFIER

3  –  Examples

    Example 1

    The following example shows how to display a unique_identifier
    value using RMU/ALTER.

    $ RMU/ALTER MF_PERSONNEL
    %RMU-I-ATTACH, now altering database
     "DEVICE:[DIRECTORY]MF_PERSONNEL.RDB;1"
      DISPLAY ROOT UNIQUE_IDENTIFIER
             Root file unique identifier is: "22-OCT-2010 13:49:27.87"
     (00AA5578688428BB)
      EXIT

    Example 2

    The following example shows that RMU/ALTER is invoked specifying
    the database MF_PERSONNEL.RDB. The user then displays the current
    Unique Identifier value in the database root, creates a new
    Unique Identifier value in the database root, displays the new
    Unique Identifier in the root, and finally specifies "commit"
    to write the new Unique Identifier value to the database root
    file and ALL database storage area files. The display messages
    designate the pending new Unique Identifier value as "(marked)"
    until the user either executes "commit" to write out the new
    Unique Identifier value or "rollback" to restore the original
    Unique Identifier value. The user then verifies the database
    changes.

    $ RMU/ALTER MF_PERSONNEL
    %RMU-I-ATTACH, now altering database "DISK:[DIRECTORY]MF_PERSONNEL.RDB;1"
      DISPLAY ROOT UNIQUE_IDENTIFIER
             Root file unique identifier is: "22-OCT-2010 13:49:27.87"
     (00AA5578688428BB)
      DEPOSIT ROOT UNIQUE_IDENTIFIER = NEW
    (marked) Root file unique identifier is: "22-OCT-2010 13:49:28.34"
     (00AA557868CC9F7A)
      DISPLAY ROOT UNIQUE_IDENTIFIER
    (marked) Root file unique identifier is: "22-OCT-2010 13:49:28.34"
     (00AA557868CC9F7A)
      COMMIT
      EXIT
    $ RMU/VERIFY/ALL/NOLOG MF_PERSONNEL