利用dbms_repair来标记和跳过坏块
SQL> select file_id, block_id, blocks from dba_extents where owner = 'LILC' and segment_name = 'TEST'; ，，，，， 610624 1024 611648 1024 83 rows selected.
破坏之前的数据：
SQL> select count(*) from test;
COUNT(*)
----------
783018
RMAN> recover datafile 6 block 11620 clear;
RMAN> recover datafile 6 block 4467 clear;
RMAN> backup check logical validate datafile 6;
Starting backup at 23-SEP-15
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00006 name=+DATA/phub/datafile/llc01.dbf
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
List of Datafiles
=================
File Status Marked Corrupt Empty Blocks Blocks Examined High SCN
---- ------ -------------- ------------ --------------- ----------
6 FAILED 0 20 12800 1991935
File Name: +DATA/phub/datafile/llc01.dbf
Block Type Blocks Failing Blocks Processed
---------- -------------- ----------------
Data 2 12140
Index 0 329
Other 1 311
validate found one or more corrupt blocks
See trace file /u01/app/oracle/diag/rdbms/phub/PHUB/trace/PHUB_ora_29666.trc for details
Finished backup at 23-SEP-15
数据查询肯定报错：
SQL> select count(*) from test;
select count(*) from test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 4467)
ORA-01110: data file 6: '+DATA/phub/datafile/llc01.dbf'
skip_corrupt_blocks来跳过坏块：
SQL> exec dbms_repair.skip_corrupt_blocks(schema_name => 'LILC',object_name => 'TEST',flags => 1);
PL/SQL procedure successfully completed.
SQL> conn lilc/lilc;
Connected.
SQL> select count(*) from test;
COUNT(*)
----------
782884
这里少了34条数据
修复坏块；
RMAN> recover datafile 6 block 11620
2> ;
Starting recover at 23-SEP-15
using channel ORA_DISK_1
using channel ORA_DISK_2
finished standby search, restored 1 blocks
starting media recovery
media recovery complete, elapsed time: 00:00:01
Finished recover at 23-SEP-15
RMAN> recover datafile 6 block 4467
Starting recover at 23-SEP-15
using channel ORA_DISK_1
using channel ORA_DISK_2
finished standby search, restored 1 blocks
starting media recovery
media recovery complete, elapsed time: 00:00:01
Finished recover at 23-SEP-15
数据正常：
SQL> select count(*) from test;
COUNT(*)
----------
783018