Oracle uses RMAN to restore the SYSTEM tablespace.

Note: The database should be supported in the archive mode. 1. Back up the SYSTEMG tablespace [Oracle @ bys001 ~] $ RmantargetRecoveryManager: Release11

Note: The database should be supported in the archive mode. 1. Back up the SYSTEMG tablespace [Oracle @ bys001 ~] $ Rman target/Recovery Manager: Release 11

Note: The database should be supported in the archive mode.

1. Back up the SYSTEMG tablespace.
[Oracle @ bys001 ~] $ Rman target/
Recovery Manager: Release 11.2.0.1.0-Production on Tue Sep 17 10:42:18 2013
Copyright (c) 1982,200 9, Oracle and/or its affiliates. All rights reserved.
Connected to target database: BYS1 (DBID = 3957527513)
RMAN> list backup;
Using target database control file instead of recovery catalog
Specification does not match any backup in the repository

RMAN> backup tablespace system;
Starting backup at 17-SEP-13
Allocated channel: ORA_DISK_1
Channel ORA_DISK_1: SID = 45 device type = DISK
Channel ORA_DISK_1: starting full datafile backup set
Channel ORA_DISK_1: specifying datafile (s) in backup set
Input datafile file number = 00001 name =/u01/oradata/bys1/system01.dbf
Channel ORA_DISK_1: starting piece 1 at 17-SEP-13
Channel ORA_DISK_1: finished piece 1 at 17-SEP-13
Piece handle =/u01/flash_recovery_area/BYS1/backupset/2013_09_17/partition _. bkp tag = TAG20130917T104438 comment = NONE
Channel ORA_DISK_1: backup set complete, elapsed time: 00:02:26
Channel ORA_DISK_1: starting full datafile backup set
Channel ORA_DISK_1: specifying datafile (s) in backup set
Including current control file in backup set
Including current SPFILE in backup set
Channel ORA_DISK_1: starting piece 1 at 17-SEP-13
Channel ORA_DISK_1: finished piece 1 at 17-SEP-13
Piece handle =/u01/flash_recovery_area/BYS1/backupset/2013_09_17/partition _. bkp tag = TAG20130917T104438 comment = NONE
Channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 17-SEP-13
RMAN> exit

Recommended reading:

Basic Oracle tutorial-copying a database through RMAN

Reference for RMAN backup policy formulation

RMAN backup learning notes

Oracle Database Backup encryption RMAN Encryption

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