备份user表空间

SQL> alter tablespace users beginbackup; 

Tablespace altered.

SQL> !cp/u01/tiger/oradata/orcl2/users01.dbf /bk 

SQL> alter tablespace users end backup; 

Tablespace altered

做交易然后破坏user表空间

SQL> !cp /etc/passwd/u01/tiger/oradata/orcl2/users01.dbf 

SQL> alter system switch logfile; 

System altered. 

SQL> select * from emp;

select * from emp

              *

ERROR at line 1:

ORA-00376: file 4 cannot be readat this time

ORA-01110: data file 4:'/u01/tiger/oradata/orcl2/users01.dbf'

SQL> select * from v$recover_file;

    FILE# ONLINE  ONLINE_ ERROR                   CHANGE# TIME

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

        4 OFFLINE OFFLINE FILE NOT FOUND                0

SQL> !cp /bk/users01.dbf/u01/tiger/oradata/orcl2/users01.dbf

SQL> select * from v$recover_file;

    FILE# ONLINE  ONLINE_ ERROR                   CHANGE# TIME

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

        4 OFFLINE OFFLINE                          563482 06-SEP-12

SQL> select * from v$recovery_log;

  THREAD#  SEQUENCE# TIME

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

ARCHIVE_NAME

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

        1         10 06-SEP-12

/u01/tiger/flash_recovery_area/ORCL2/archivelog/2012_09_06/o1_mf_1_10_84jpo5bw_.arc

        1         11 06-SEP-12

/u01/tiger/flash_recovery_area/ORCL2/archivelog/2012_09_06/o1_mf_1_11_84jpoctx_.arc 

SQL> alter tablespace users online;

alter tablespace users online

*

ERROR at line 1:

ORA-01113: file 4 needs mediarecovery

ORA-01110: data file 4:'/u01/tiger/oradata/orcl2/users01.dbf'

SQL> recoverdatafile 4;

Media recovery complete.

SQL> alter tablespace users online;