{ ACTIVATE [PHYSICAL] STANDBY DATABASE
| SET STANDBY DATABASE { PROTECTED | UNPROTECTED }
| REGISTER [OR REPLACE] [PHYSICAL] LOGFILE [filespec [, filespec]...]
| PREPARE TO SWITCHOVER TO 
  { PHYSICAL PRIMARY
  | PHYSICAL STANDBY
  }
  [ WAIT | NOWAIT ]
} 
[parallel_clause]

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.