无RMAN备份集情况下的坏块恢复
虽然在没有RMAN备份集的情况下，通过热备文件可以把丢失的数据恢复出来，但这毕竟还是很不靠谱的。在生产环境中，我们几乎不可能
测试的环境是没有可用的RMAN备份集，但是有数据文件的热备，下面来看测试：
--创建测试用户和测试表
[Oracle@ora10g ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 16 16:01:02 2014
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, OLAP and Data Mining options
SQL> create user zlm identified by zlm;
User created.
SQL> alter user zlm default tablespace zlm;
User altered.
SQL> grant dba to zlm;
Grant succeeded.
SQL> conn zlm/zlm
Connected.
SQL> create table corrupt_test (id number(10),name varchar2(15));
Table created.
SQL> insert into corrupt_test values(1,'aaron8219');
1 row created.
SQL> commit;
Commit complete.
SQL> set lin 130
SQL> col segment_name for a20
SQL> col tablespace_name for a20
SQL> select segment_name,tablespace_name from dba_segments where segment_name='CORRUPT_TEST';
SEGMENT_NAME TABLESPACE_NAME
-------------------- --------------------
CORRUPT_TEST ZLM
SQL> col name for a45
SQL> select a.segment_name,a.tablespace_name,b.file#,b.name from dba_segments a,v$datafile b where a.header_file=b.file# and a.segment_name='CORRUPT_TEST';
SEGMENT_NAME TABLESPACE_NAME FILE# NAME
-------------------- -------------------- ---------- ---------------------------------------------
CORRUPT_TEST ZLM 6 /u01/app/oracle/oradata/ora10g/zlm01.dbf
由于之前做过RMAN备份，所以先把备份集删除
[oracle@ora10g ~]$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on 16 16:06:47 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: ORA10G (DBID=4175411955)
RMAN> list backupset;
using target database control file instead of recovery catalog
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
286 Full 880.50M DISK 00:01:35 2014-11-12
BP Key: 286 Status: AVAILABLE Compressed: NO Tag: TAG20141112T141548
Piece Name: /u01/app/oracle/flash_recovery_area/ORA10G/backupset/2014_11_12/o1_mf_nnndf_TAG20141112T141548_b65yrnkg_.bkp
List of Datafiles in backup set 286
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- ---------- ----
1 Full 1202813 2014-11-12 /u01/app/oracle/oradata/ora10g/system01.dbf
2 Full 1202813 2014-11-12 /u01/app/oracle/oradata/ora10g/undotbs01.dbf
3 Full 1202813 2014-11-12 /u01/app/oracle/oradata/ora10g/sysaux01.dbf
4 Full 1202813 2014-11-12 /u01/app/oracle/oradata/ora10g/users01.dbf
5 Full 1202813 2014-11-12 /u01/app/oracle/oradata/ora10g/example01.dbf
6 Full 1202813 2014-11-12
BS Key Size Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
302 42.17M DISK 00:00:27 2014-11-21
BP Key: 302 Status: AVAILABLE Compressed: YES Tag: ARC_BAK
Piece Name: /u01/orabackup/backupsets/ora10g-4175411955_20141121_864227317_351.arc
List of Archived Logs in backup set 302
Thrd Seq Low SCN Low Time Next SCN Next Time
---- ------- ---------- ---------- ---------- ---------
1 39 1234835 2014-11-18 1247748 2014-11-21
1 40 1247748 2014-11-21 1249682 2014-11-21
1 41 1249682 2014-11-21 1250181 2014-11-21
1 42 1250181 2014-11-21 1258063 2014-11-21
1 43 1258063 2014-11-21 1260208 2014-11-21