A new feature called the Snapshot DATABASE in 11g reduces the amount of manual steps in previous versions to accomplish the same tasks. See other posts about DATAGUARD and FLASHBACK. This allows you to use a physical standby for all sorts of tasks besides just disaster recovery.
The following steps are done on the physical standby. Redo data is still being shipped from the primary.
SQL> ALTER SYSTEM SET DB_RECOVERY_FILE_DEST_SIZE=50G;
SQL> shutdown immediate;
ORA-01507: database not mounted
ORACLE instance shut down.
SQL> startup mount ;
SQL> ALTER DATABASE CONVERT TO PHYSICAL STANDBY;
SQL > ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;