Parameters
FILE The name of the database file to verify.
START The starting block address to verify. Specify block addresses in
Oracle blocks (as opposed to operating system blocks). If you do
not specify START, DBVERIFY defaults to the first block in the
file.
END The ending block address to verify. If you do not specify END,
DBVERIFY defaults to the last block in the file.
BLOCKSIZE BLOCKSIZE is required only if the file to be verified has a
non-2kb block size. If you do not specify BLOCKSIZE for
non-2kb files, you will see the error DBV- 00103 .
LOGFILE Specifies the file to which logging information should be
written. The default sends output to the terminal display.
FEEDBACK Specifying the keyword FEEDBACK causes DBVERIFY to send
a progress display to the terminal in the form of a single dot  "." 
for n number of pages verified during the DBVERIFY run. If
n =  0 , there will be no progress display.
HELP Provides onscreen help.
PARFILE Specifies the name of the parameter file to use. You can store
various values for DBVERIFY parameters in flat files. This
allows you to customize parameter files to handle different types
of datafiles and to perform specific types of integrity checks on
datafiles.