SQL> RECOVER MANAGED STANDBY DATABASE CANCEL;
SQL> ALTER DATABASE OPEN READ ONLY;
Back to Mount Point ( Same as Before Open in Read Only ) :
SQL > shutdown;
SQL > startup nomount
SQL > alter database mount standby database
SQL > alter database recover managed standby database disconnect from session;
Switch Over Primary As Standby , And Standby As Primary
Primary Database : Prim
Standby Database : Stdby
On Prim :
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO STANDBY;
SQL> SHUTDOWN NORMAL;
SQL> STARTUP NOMOUNT;
SQL> ALTER DATABASE MOUNT STANDBY DATABASE;
On standby:
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
SQL> SHUTDOWN;
SQL> STARTUP;
On Prim :
SQL> ALTER DATABASE RECOVDR MANAGED STANDBY DATABASE;
On standby:
SQL> ALTER SYSTEM ARCHIVE LOG START;
SQL> ALTER SYSTEM SWITCH LOGFILE
Thank you
Osama Mustafa
Technology Geek 