undo表空間的資料檔案丟失，如果有備份的情況下，恢復非常簡單，下邊給出一個例子：

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Mar 12 18:02:13 2015

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 1

Next log sequence to archive 2

Current log sequence 2

SQL> exit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@rhel6_lhr ~]$ rman target /

Recovery Manager: Release 10.2.0.4.0 - Production on Thu Mar 12 18:02:23 2015

connected to target database: ORA1024G (DBID=2698093861)

RMAN> backup database;

Starting backup at 2015-03-12 18:02:30

using target database control file instead of recovery catalog

allocated channel: ORA_DISK_1

channel ORA_DISK_1: sid=144 devtype=DISK

channel ORA_DISK_1: starting full datafile backupset

channel ORA_DISK_1: specifying datafile(s) in backupset

input datafile fno=00001 name=/u03/app/oracle/oradata/ora1024g/system01.dbf

input datafile fno=00003 name=/u03/app/oracle/oradata/ora1024g/sysaux01.dbf

input datafile fno=00005 name=/u03/app/oracle/oradata/ora1024g/example01.dbf

input datafile fno=00002 name=/u03/app/oracle/oradata/ora1024g/undotbs01.dbf

input datafile fno=00004 name=/u03/app/oracle/oradata/ora1024g/users01.dbf

channel ORA_DISK_1: starting piece 1 at 2015-03-12 18:02:31

channel ORA_DISK_1: finished piece 1 at 2015-03-12 18:03:49

piece handle=/u03/app/oracle/flash_recovery_area/ORA1024G/backupset/2015_03_12/o1_mf_nnndf_TAG20150312T180231_bj2s1vh3_.bkp tag=TAG20150312T180231 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:01:19

channel ORA_DISK_1: starting full datafile backupset

channel ORA_DISK_1: specifying datafile(s) in backupset

including current control file in backupset

including current SPFILE in backupset

channel ORA_DISK_1: starting piece 1 at 2015-03-12 18:03:53

channel ORA_DISK_1: finished piece 1 at 2015-03-12 18:03:54

piece handle=/u03/app/oracle/flash_recovery_area/ORA1024G/backupset/2015_03_12/o1_mf_ncsnf_TAG20150312T180231_bj2s49dm_.bkp tag=TAG20150312T180231 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03

Finished backup at 2015-03-12 18:03:54

RMAN> report schema;

Report of database schema

List of Permanent Datafiles

===========================

File Size(MB) Tablespace RB segs Datafile Name

---- -------- -------------------- ------- ------------------------

1 480 SYSTEM *** /u03/app/oracle/oradata/ora1024g/system01.dbf

2 30 UNDOTBS1 *** /u03/app/oracle/oradata/ora1024g/undotbs01.dbf

3 250 SYSAUX *** /u03/app/oracle/oradata/ora1024g/sysaux01.dbf

4 5 USERS *** /u03/app/oracle/oradata/ora1024g/users01.dbf

5 100 EXAMPLE *** /u03/app/oracle/oradata/ora1024g/example01.dbf

List of Temporary Files

=======================

File Size(MB) Tablespace Maxsize(MB) Tempfile Name

---- -------- -------------------- ----------- --------------------

1 20 TEMP 32767 /u03/app/oracle/oradata/ora1024g/temp01.dbf

RMAN> exit

Recovery Manager complete.

[oracle@rhel6_lhr ~]$ rm /u03/app/oracle/oradata/ora1024g/undotbs01.dbf

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Mar 12 18:05:00 2015

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> startup force;

ORACLE instance started.

Total System Global Area 448790528 bytes

Fixed Size 2084616 bytes

Variable Size 130023672 bytes

Database Buffers 310378496 bytes

Redo Buffers 6303744 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 2 - see DBWR trace file

ORA-01110: data file 2: '/u03/app/oracle/oradata/ora1024g/undotbs01.dbf'

SQL> exit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@rhel6_lhr ~]$ rman target /

Recovery Manager: Release 10.2.0.4.0 - Production on Thu Mar 12 18:05:37 2015

connected to target database: ORA1024G (DBID=2698093861, not open)

RMAN> restore tablespace undotbs1;

Starting restore at 2015-03-12 18:05:56

using target database control file instead of recovery catalog

allocated channel: ORA_DISK_1

channel ORA_DISK_1: sid=156 devtype=DISK

channel ORA_DISK_1: starting datafile backupset restore

channel ORA_DISK_1: specifying datafile(s) to restore from backup set

restoring datafile 00002 to /u03/app/oracle/oradata/ora1024g/undotbs01.dbf

channel ORA_DISK_1: reading from backup piece /u03/app/oracle/flash_recovery_area/ORA1024G/backupset/2015_03_12/o1_mf_nnndf_TAG20150312T180231_bj2s1vh3_.bkp

channel ORA_DISK_1: restored backup piece 1

piece handle=/u03/app/oracle/flash_recovery_area/ORA1024G/backupset/2015_03_12/o1_mf_nnndf_TAG20150312T180231_bj2s1vh3_.bkp tag=TAG20150312T180231

channel ORA_DISK_1: restore complete, elapsed time: 00:00:06

Finished restore at 2015-03-12 18:06:03

RMAN> recover tablespace undotbs1;

Starting recover at 2015-03-12 18:06:17

using channel ORA_DISK_1

starting media recovery

media recovery complete, elapsed time: 00:00:02

Finished recover at 2015-03-12 18:06:19

RMAN> alter database open;

database opened

--注意這裡一定要讓undo線上

RMAN> sql 'alter database datafile 2 online';

using target database control file instead of recovery catalog

sql statement: alter database datafile 2 online

RMAN> exit

RMAN> report schema;

Report of database schema

List of Permanent Datafiles

===========================

File Size(MB) Tablespace RB segs Datafile Name

---- -------- -------------------- ------- ------------------------

1 480 SYSTEM *** /u03/app/oracle/oradata/ora1024g/system01.dbf

2 30 UNDOTBS1 *** /u03/app/oracle/oradata/ora1024g/undotbs01.dbf

3 250 SYSAUX *** /u03/app/oracle/oradata/ora1024g/sysaux01.dbf

4 5 USERS *** /u03/app/oracle/oradata/ora1024g/users01.dbf

5 100 EXAMPLE *** /u03/app/oracle/oradata/ora1024g/example01.dbf

List of Temporary Files

=======================

File Size(MB) Tablespace Maxsize(MB) Tempfile Name

---- -------- -------------------- ----------- --------------------

1 20 TEMP 32767 /u03/app/oracle/oradata/ora1024g/temp01.dbf

RMAN>

undo表空間檔案丟失恢復（1）--有備份

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