SQL> startup
ORACLE instance started.
 
Total System Global Area  213909504 bytes
Fixed Size                  1266656 bytes
Variable Size             159386656 bytes
Database Buffers           50331648 bytes
Redo Buffers                2924544 bytes
Database mounted.
ORA-01122: database file 7 failed verification check
ORA-01110: data file 7: '/u02/oradata/crmdb/test01.dbf'
ORA-01200: actual file size of 99 is smaller than correct size of 1280 blocks

方法一：有备份直接还原

方法二：没有备份，而且这个文件没用

SQL> alter database datafile 7 offline drop;
 
Database altered.
 
SQL> select status from v$Instance;
 
STATUS
------------
MOUNTED
 
SQL> alter database open;
 
Database altered.
 方法三：没有备份，数据文件丢失的部分都是没有使用过的

[oracle@localhost crmdb]$ dd if=/dev/zero f= test01.dbf bs=8k seek=100 count=1181
读入了 1181+0 个块
输出了 1181+0 个块

SQL> alter database open;
 
Database altered.

当使用第三种方式修复后，使用DBV或者做rman时候将会提示：

RMAN> backup datafile 7;
 
Starting backup at 21-JAN-10
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00007 name=/u02/oradata/crmdb/test01.dbf
channel ORA_DISK_1: starting piece 1 at 21-JAN-10
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 01/21/2010 09:44:00
ORA-19566: exceeded limit of 0 corrupt blocks for file /u02/oradata/crmdb/test01.dbf

DBV:

DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 1126
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 34
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 0
Total Pages Marked Corrupt   : 120
Total Pages Influx           : 0
Highest block SCN            : 2332545757 (2576.2332545757)

此时执行：

SQL> begin
  2  loop
  3     insert into for_fix2 values(1);
  4     commit;
  5  end loop;
  6  end;
  7  /

alter system checkpoint;

DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 1236
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 44
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 0
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Highest block SCN            : 2332687823 (2576.2332687823)

RMAN> backup datafile 7;
 
Starting backup at 21-JAN-10
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00007 name=/u02/oradata/crmdb/test01.dbf
channel ORA_DISK_1: starting piece 1 at 21-JAN-10
channel ORA_DISK_1: finished piece 1 at 21-JAN-10
piece handle=/u01/app/oracle/dbs/19l40pm1_1_1 tag=TAG20100121T103439 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 21-JAN-10
 
Starting Control File and SPFILE Autobackup at 21-JAN-10
piece handle=/usr/Oracle/backup/script/full_back/auto_c_c-3778963517-20100121-00.bak comment=NONE
Finished Control File and SPFILE Autobackup at 21-JAN-10
 
RMAN>