Optimizes database attach operations for all database users by
 mapping the database root file for each process.  Overhead normally
 charged to your process is absorbed by Rdb/VMS when you use the OPEN
 statement.

 You must have ADMINISTRATOR privilege on the database access control
 list to use the OPEN statement.

 Digital Equipment Corporation recommends that you use the RMU/OPEN
 command instead of the RDO statement OPEN.

Additional information available:

Format

 OPEN ────┬────> 
F
I
L
E
N
A
M
E file-spec ────┬───>
          └────> 
P
A
T
H
N
A
M
E path-name ────┘

Additional information available:

path-namefile-spec

 The full or relative data dictionary path name for the database
 directory in which the database file resides.

 The VMS file specification for the database file.