ALTER SYSTEM
  { archive_log_clause
  | checkpoint_clause
  | check_datafiles_clause
  | DUMP ACTIVE SESSION HISTORY [ MINUTES integer ]
  | distributed_recov_clauses
  | restricted_session_clauses
  | FLUSH { SHARED_POOL | BUFFER_CACHE }
  | end_session_clauses
  | SWITCH LOGFILE
  | { SUSPEND | RESUME }
  | quiesce_clauses
  | shutdown_dispatcher_clause
  | REGISTER
  | SET alter_system_set_clause
        [ alter_system_set_clause ]...
  | RESET alter_system_reset_clause
          [ alter_system_reset_clause ]...
  } ;