Backing Up Oracle - Computing at Cornell

Archive log backup sets are restored as needed to perform a recovery. They
are restored to the current archive log destination as specified in the init.ora
file.
12.3 Recovery examples
In the following sections we provide some examples of recovery using RMAN.
12.3.1 Data file recovery
To test a datafile recovery with RMAN, we performed following steps:
The Oracle instance beach was up and running, and a backup of the
database was taken.
User scott in a SQL*Plus session connected to beach, created a new table
oops in the USERS tablespace, inserted a row, and committed the changes.
The database was shut down with the shutdown immediate command.
The USERS data file was destroyed by the command
C:\oracle\oradata\beach>echo hello > users01.dbf
The database was started with the startup command, an error was
returned.
The alertlog file of the instance contained the following entries.
Errors in file c:\oracle\admin\beach\bdump\beachDBW0.TRC:
ORA-01157: cannot identify/lock data file 3 - see DBWR trace file
ORA-01110: data file 3: 'C:\ORACLE\ORADATA\BEACH\USERS01.DBF'
ORA-27048: skgfifi: file header information is invalid
OSD-04004: invalid file header
Next, we created the following RMAN command file and executed it
RMAN> run {
allocate channel t1 type 'sbt_tape';
restore datafile 'C:\ORACLE\ORADATA\BEACH\USERS01.DBF';
recover datafile 'C:\ORACLE\ORADATA\BEACH\USERS01.DBF';
release channel t1;
alter database open;
}
Chapter 12. Recovering Oracle databases on Windows 2000 191