Steps to Restoring and Recovering Files Over the Network:

Primary DB = chicago, its net service name is chicago
Standby DB = boston, its net service name is boston

You want to restore lost data files, control files, or tablespaces on a primary database using the corresponding files on the physical standby database. You can also restore files on a physical standby database by using the primary database.

The data file users01.dbf on the primary database was lost. You want to restore this data file from the physical standby database. The service name of the physical standby database is boston. The RESTORE command with the FROM SERVICE clause enables you to restore the lost data file in the primary database by using the data file in the physical standby database. The password file in the primary database and the physical standby database is the same.

Use the following steps to restore the data file users01.dbf in the primary database by using the data file in the physical standby database:

1. Connect to the primary database as a user with the SYSBACKUP privilege.

RMAN> connect target "C##[email protected] as sysbackup";

Enter the password for the C##SCOTT user when prompted.

2. Ensure that the tnsnames.ora file in the physical standby database contains an entry corresponding to the primary database. Also ensure that the password files on the primary and physical standby database are the same.

3. Restore the data file on the primary database by using the data file on the physical standby database as below:

RMAN> RESTORE DATAFILE '/u01/oradata/primary/chicago/users01.dbf' FROM SERVICE boston;

Starting restore at 25-APR-15
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=31 device type=DISK

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: using network backup set from service boston
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00006 to /u01/oradata/primary/chicago/users01.dbf
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 25-APR-15