Prerequisite: need to take full RMAN backup of the database.
-Connect to RMAN commnad prompt.
[oracle@localhost trace]$ rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Wed Apr 1 12:06:44 2015
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1341150024)
-Put the data file in to offline, Here we can use missing datafile name or datafile number. I am using datafile number.
RMAN> sql 'alter database datafile 5 offline';
using target database control file instead of recovery catalog
sql statement: alter database datafile 5 offline
-Restore the datafile from backup.
RMAN> restore datafile 5;
Starting restore at 01-APR-15
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/orcl/example01.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/flash_recovery_area/ORCL/backupset/2015_04_01/o1_mf_nnndf_TAG20150401T114744_bkq3dbcn_.bkp
channel ORA_DISK_1: piece handle=/u01/app/oracle/flash_recovery_area/ORCL/backupset/2015_04_01/o1_mf_nnndf_TAG20150401T114744_bkq3dbcn_.bkp tag=TAG20150401T114744
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:35
Finished restore at 01-APR-15
-Recover datafile
RMAN> recover datafile 5;
Starting recover at 01-APR-15
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:01
Finished recover at 01-APR-15
-put the datafile into online.
RMAN> sql 'alter database datafile 5 online';
sql statement: alter database datafile 5 online
RMAN> exit
-Recovery Manager complete.
SQL> select status from v$datafile;
STATUS
-------
SYSTEM
ONLINE
ONLINE
ONLINE
ONLINE
ONLINE
6 rows selected.
