Convert snapshot standby database to Physical standby database: Dataguard 11gR2

Step 1
SQL> shutdown immediate;

Step 2
SQL> startup nomount

Step 3
SQL> alter database mount;

Step 4
SQL>  ALTER DATABASE CONVERT TO PHYSICAL STANDBY;

Step 5
SQL> shutdown database;

Step 6
SQL> startup nomount;
SQL> alter database mount standby database;

Step 7
SQL> alter database open;
SQL> alter database recover managed standby database disconnect;

Step 8

set pagesize 1000

set linesize 1000

col HOST_NAME for a20

select INSTANCE_NAME,OPEN_MODE,DATABASE_ROLE from v$instance,v$database;