database recovery failed -- access to database denied by monitor

  Explanation:  To maintain the integrity  of  the  database,  the
  monitor  forced  your  image exit because an unrecoverable error
  has been detected.

  User Action:  Look  for  a  file  named  SYS$SYSTEM:*DBRBUG.DMP.
  This  is  a DataBase Recovery process bugcheck dump.  Search the
  file  for  a  string  of  five  asterisks  (*****)   using   the
  SEARCH/WINDOW  command.   You  will  see  a  line  with a format
  similar to this:  *****  Exception  at  <address>  :   <database
  module  name>  +  <offset> %facility-severity-text, <error text>
  The exception line will be followed by one  or  more  additional
  errors  that will help you to determine what caused the recovery
  process to fail.  Possible causes include:  low quotas,  missing
  Recovery-Unit   Journal   (RUJ)   files,  or  filename  logicals
  misdefined or undefined.  Depending on the cause of the problem,
  take  the  appropriate  action.  If you are uncertain of what to
  do, contact your Oracle support representative for assistance.