alter database for datagurad
alter database add standby logfile group ‘’size
alter database add standby logfile member ” to group n
alter database commit to switchover to primary|physical logical standby with|without session shutdown wait|nowait
alter database create physical|logical standby controlfile a ” [reuse]
alter database drop standby logfile logfile_descriptor
alter database drop standby logfile member ‘filename’[no] force logging
alter database mount standby database
alter database open
alter database prepare to switchover to [primary]|physical|logical [with|without session shutdown ] [wait|nowait]
alter database recover managed standby database [[NODELAY][DISCONNECT [FROM SESSION]][NOPARALLEL|PARALLEL [integer]][UNTIL CHANGE scn][USING CURRENT LOGFILE] ]
alter database RECOVER MANAGED STANDBY DATABASE CANCEL [[NOWAIT]|[WAIT][IMMEDIATE] ]
alter database RECOVER MANAGED STANDBY DATABASE FINISH [FORCE][NOWAIT|WAIT] ]
alter database REGISTER [OR REPLACE] [PHYSICAL|LOGICAL] LOGFILE filespec
alter database RECOVER TO LOGICAL STANDBY new_database_name
alter database RESET DATABASE TO INCARNATION integer
alter database START LOGICAL STANDBY APPLY INITIAL [scn-value] ] [NEW PRIMARY dblink]
alter database {STOP|ABORT} LOGICAL STANDBY APPLY
alter database ACTIVATE [PHYSICAL|LOGICAL] STANDBY DATABASE FINISH APPLY]
