在RMAN的备份中，可以通过Exclude命令排除某些不需要备份的表空间。
这样可以缩减备份的容量，对备份进行适当优化和调整。
排除某个表空间可以使用类似如下命令：
configure exclude for tablespace users;
其设置可以在RMAN中通过show exclude命令来查看。
如果将来想临时增加排除表空间的备份，可以通过以下命令实现：
backup database noexclude;
如果想取消排除设置则可以使用如下命令：
CONFIGURE EXCLUDE FOR TABLESPACE users CLEAR;
此外常用的排除备份命令还有：
BACKUP DATABASE SKIP READONLY, SKIP OFFLINE;
以下是一个简单的测试过程。
执行备份：
[oracle@test126 udump]$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Mon Oct 9 06:47:19 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: EYGLE (DBID=2590148133)
RMAN> configure exclude for tablespace users;
using target database control file instead of recovery catalog
tablespace USERS will be excluded from future whole database backups
new RMAN configuration parameters are successfully stored
RMAN> backup full database;
Starting backup at 09-OCT-06
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=527 devtype=DISK
file 4 is excluded from whole database backup
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=/opt/oracle/oradata/eygle/system01.dbf
input datafile fno=00003 name=/opt/oracle/oradata/eygle/sysaux01.dbf
input datafile fno=00002 name=/opt/oracle/oradata/eygle/undotbs01.dbf
channel ORA_DISK_1: starting piece 1 at 09-OCT-06
channel ORA_DISK_1: finished piece 1 at 09-OCT-06
piece handle=/opt/oracle/flash_recovery_area/EYGLE/backupset/
2006_10_09/o1_mf_nnndf_TAG20061009T070612_2lm135od_.bkp tag=TAG20061009T070612 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:48
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
including current control file in backupset
channel ORA_DISK_1: starting piece 1 at 09-OCT-06
channel ORA_DISK_1: finished piece 1 at 09-OCT-06
piece handle=/opt/oracle/flash_recovery_area/EYGLE/backupset/
2006_10_09/o1_mf_ncnnf_TAG20061009T070612_2lm14ppc_.bkp tag=TAG20061009T070612 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:02
Finished backup at 09-OCT-06
RMAN> exit
Recovery Manager complete.
然后关闭数据库，我们可以进行一次恢复尝试：
[oracle@test126 udump]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Oct 9 07:07:28 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning and Data Mining options
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
/opt/oracle/oradata/eygle/system01.dbf
/opt/oracle/oradata/eygle/undotbs01.dbf
/opt/oracle/oradata/eygle/sysaux01.dbf
/opt/oracle/oradata/eygle/users01.dbf
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning and Data Mining options
看看恢复进程：
[oracle@test126 udump]$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Mon Oct 9 07:08:40 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database (not started)
RMAN> startup mount;
Oracle instance started
database mounted
Total System Global Area 536870912 bytes
Fixed Size 1220460 bytes
Variable Size 150995092 bytes
Database Buffers 377487360 bytes
Redo Buffers 7168000 bytes
RMAN> restore database;
Starting restore at 09-OCT-06
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=542 devtype=DISK
file 4 is excluded from whole database backup
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to /opt/oracle/oradata/eygle/system01.dbf
restoring datafile 00002 to /opt/oracle/oradata/eygle/undotbs01.dbf
restoring datafile 00003 to /opt/oracle/oradata/eygle/sysaux01.dbf
channel ORA_DISK_1: reading from backup piece /opt/oracle/flash_recovery_area/EYGLE/backupset/
2006_10_09/o1_mf_nnndf_TAG20061009T070612_2lm135od_.bkp
channel ORA_DISK_1: restored backup piece 1
piece handle=/opt/oracle/flash_recovery_area/EYGLE/backupset/
2006_10_09/o1_mf_nnndf_TAG20061009T070612_2lm135od_.bkp tag=TAG20061009T070612
channel ORA_DISK_1: restore complete, elapsed time: 00:00:36
failover to previous backup
Finished restore at 09-OCT-06
RMAN> recover database;
Starting recover at 09-OCT-06
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:02
Finished recover at 09-OCT-06
RMAN> alter database open;
database opened
RMAN>
但是需要注意，如果未备份的表空间文件丢失，不可恢复，你可能需要重建以还原数据库。
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