oracle 数据库坏块--物理坏块
数据坏块的类型
物理坏块：通常是由于硬件损坏如磁盘异常导致、内存有问题、存储链有问题、 IO有问题、文件系统有问题、 Oracle本身的问题等
逻辑坏块：可能都是软件问题导致通常是由于oracle bug导致，比如data block和index block数据不一致
第三方软件或者硬件造成的物理损坏
物理数据坏块的场景
常见的物理坏块（Physical Block Corruptions）有块头和块尾信息不一致(Fractured/Incomplete)，checksum值无效，数据块信息全部为0等情况，
并且可能伴随错误ORA-1578和ORA-1110
1.Bad header - the beginning of the block (cache header) is corrupt with invalid values
2.The block is Fractured/Incomplete - header and footer of the block do not match
3.The block checksum is invalid
4.The block is misplaced
5.Zeroed out blocks/ORA-8103模拟
物理坏块的模拟--分别模拟5中情况
1.Bad header - the beginning of the block (cache header) is corrupt with invalid values
create tablespace yhqt datafile '/u01/app/oracle/oradata/orcl/yhqt01.dbf' size 50M;
create user yhqt identified by yhqt default tablespace yhqt;
grant dba to yhqt;
SYS@ orcl >conn yhqt/***
Connected.
YHQT@ orcl >create table yhqtest_1(id int,name varchar2(100));
Table created.
YHQT@ orcl >insert into yhqtest_1 values(1,'yhq');
1 row created.
YHQT@ orcl >commit;
Commit complete.
YHQT@ orcl >select
dbms_rowid.rowid_relative_fno(rowid) rel_fno,
dbms_rowid.rowid_block_number(rowid) blockno
from yhqtest_1; 2 3 4
REL_FNO BLOCKNO
---------- ----------
10 135
--使用bbed，手动修改数据块
BBED> set file 10 block 135
FILE# 10
BLOCK# 135
BBED> map /v
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 135 Dba:0x02800087
------------------------------------------------------------
BBED-00400: invalid blocktype (00)
YHQT@ orcl >alter system flush buffer_cache;
System altered.
BBED> set file 10 block 135
FILE# 10
BLOCK# 135
BBED> map /v
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 135 Dba:0x02800087
------------------------------------------------------------
BBED> p kcbh
struct kcbh, 20 bytes @0
ub1 type_kcbh @0 0x06
ub1 frmt_kcbh @1 0xa2
ub1 spare1_kcbh @2 0x00
ub1 spare2_kcbh @3 0x00
ub4 rdba_kcbh @4 0x02800087
ub4 bas_kcbh @8 0x009e4d78
ub2 wrp_kcbh @12 0x0000
ub1 seq_kcbh @14 0x01 >>01 修改为ff
ub1 flg_kcbh @15 0x06 (KCBHFDLC, KCBHFCKV)
ub2 chkval_kcbh @16 0xf4f8
ub2 spare3_kcbh @18 0x0000
BBED> modify /x ff offset 14
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 135 Offsets: 14 to 525 Dba:0x02800087
------------------------------------------------------------------------
ff06f8f4 00000100 00003d59 0100764d 9e000000 000002f8 32008000 80020500
BBED> sum apply
Check value for File 10, Block 135:
current = 0xf406, required = 0xf406
--重启db，并查询
SYS@ orcl >conn yhqt/***
Connected.
YHQT@ orcl >select * from yhqtest_1;
select * from yhqtest_1
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 10, block # 135)
ORA-01110: data file 10: '/u01/app/oracle/oradata/orcl/yhqt01.dbf'
--报错ORA-01578: ORACLE data block corrupted
[oracle@DSI ~]$ tail -n 20 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.log
Data in bad block:
type: 6 format: 2 rdba: 0x02800087
last change scn: 0x0000.009e4d78 seq: 0xff flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x4d780601
check value in block header: 0xf406
computed block checksum: 0x0
Reread of blocknum=135, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
Reread of blocknum=135, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
Reread of blocknum=135, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
Reread of blocknum=135, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
Reread of blocknum=135, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
Checker run found 1 new persistent data failures
Fri Jul 12 10:46:57 2019
Dumping diagnostic data in directory=[cdmp_20190712104657], requested by (instance=1, osid=2812), summary=[incident=63755].
Dumping diagnostic data in directory=[cdmp_20190712104658], requested by (instance=1, osid=2812), summary=[incident=63756].
Fri Jul 12 10:47:16 2019
Sweep [inc][63756]: completed
Sweep [inc2][63756]: completed
Sweep [inc2][63755]: completed
YHQT@ orcl >insert into yhqtest_1 values(1,'yhq');
insert into yhqtest_1 values(1,'yhq')
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 10, block # 135)
ORA-01110: data file 10: '/u01/app/oracle/oradata/orcl/yhqt01.dbf'
[oracle@DSI ~]$ dbv file=/u01/app/oracle/oradata/orcl/yhqt01.dbf
DBVERIFY: Release 11.2.0.4.0 - Production on Fri Jul 12 10:50:42 2019
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
DBVERIFY - Verification starting : FILE = /u01/app/oracle/oradata/orcl/yhqt01.dbf
Page 135 is influx - most likely media corrupt
Corrupt block relative dba: 0x02800087 (file 10, block 135)
Fractured block found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x02800087
last change scn: 0x0000.009e4d78 seq: 0xff flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x4d780601
check value in block header: 0xf406
computed block checksum: 0x0
DBVERIFY - Verification complete
Total Pages Examined : 6400
Total Pages Processed (Data) : 4
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing (Index): 0
Total Pages Processed (Other): 130
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 6265
Total Pages Marked Corrupt : 1
Total Pages Influx : 1
Total Pages Encrypted : 0
Highest block SCN : 10374518 (0.10374518)
YHQT@ orcl >select * from v$database_block_corruption;
FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
10 135 1 0 FRACTURED ##发现数据块物理损坏
用rman恢复，发现没有datafile=10的备份，无法恢复
RMAN> run {blockrecover datafile 10 block 135;}
Starting recover at 12-JUL-19
starting full resync of recovery catalog
full resync complete
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=142 device type=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 07/12/2019 10:52:22
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 10 found to restore
--跳过坏块的修复，但是坏的数据丢失了
YHQT@ orcl >alter session set db_file_multiblock_read_count=1;
Session altered.
YHQT@ orcl >execute DBMS_REPAIR.SKIP_CORRUPT_BLOCKS('YHQT','YHQTEST_1');
BEGIN DBMS_REPAIR.SKIP_CORRUPT_BLOCKS('YHQT','YHQTEST_1'); END;
*
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00201: identifier 'DBMS_REPAIR.SKIP_CORRUPT_BLOCKS' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
YHQT@ orcl >conn / as sysdba
Connected.
SYS@ orcl >execute DBMS_REPAIR.SKIP_CORRUPT_BLOCKS('YHQT','YHQTEST_1');
PL/SQL procedure successfully completed.
SYS@ orcl >create table YHQT.yhqtest_1_new as select * from YHQT.yhqtest_1;
Table created.
SYS@ orcl >conn yhqt/***
Connected.
YHQT@ orcl >select * from yhqtest_1_new;
no rows selected
YHQT@ orcl >select * from yhqtest_1;
no rows selected
2.The block is Fractured/Incomplete - header and footer of the block do not match
YHQT@ orcl >create table yhqtest_2(id int,name varchar2(100));
Table created.
YHQT@ orcl >insert into yhqtest_2 values(1,'yhq');
1 row created.
YHQT@ orcl >commit;
Commit complete.
YHQT@ orcl >alter system flush buffer_cache;
System altered.
YHQT@ orcl >select
dbms_rowid.rowid_relative_fno(rowid) rel_fno,
dbms_rowid.rowid_block_number(rowid) blockno
from yhqtest_2; 2 3 4
REL_FNO BLOCKNO
---------- ----------
10 143
BBED> set file 10 block 143;
FILE# 10
BLOCK# 143
BBED> dump /v offset 8188
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 143 Offsets: 8188 to 8191 Dba:0x0280008f
-------------------------------------------------------
0106f553 l ..
<16 bytes per line>
BBED> modify /x 0106f554
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 143 Offsets: 8188 to 8191 Dba:0x0280008f
------------------------------------------------------------------------
0106f554
<32 bytes per line>
BBED> sum apply
Check value for File 10, Block 143:
current = 0x46ca, required = 0x46ca
--刷新并查询
YHQT@ orcl >alter system flush buffer_cache;
System altered.
YHQT@ orcl >select * from yhqtest_2;
select * from yhqtest_2
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 10, block # 143)
ORA-01110: data file 10: '/u01/app/oracle/oradata/orcl/yhqt01.dbf'
--报错01578 >>>Fractured block
ALTER SYSTEM: Flushing buffer cache
Hex dump of (file 10, block 143) in trace file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_2890.trc
Corrupt block relative dba: 0x0280008f (file 10, block 143)
Fractured block found during multiblock buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x0280008f
last change scn: 0x0000.009e53f5 seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x54f50601
check value in block header: 0x46ca
computed block checksum: 0x0
3.The block checksum is invalid
checksum是oracle写入后，其他外部因素导致块checksum改变的情况
checksum只有DBWR进程写入，或者直接从磁盘上读取
YHQT@ orcl >create table yhqtest_3(id int,name varchar2(100));
Table created.
YHQT@ orcl >insert into yhqtest_3 values(1,'yhq33333');
1 row created.
YHQT@ orcl >commit;
Commit complete.
YHQT@ orcl >select
dbms_rowid.rowid_relative_fno(rowid) rel_fno,
dbms_rowid.rowid_block_number(rowid) blockno
from yhqtest_3; 2 3 4
REL_FNO BLOCKNO
---------- ----------
10 151
YHQT@ orcl >alter system flush buffer_cache;
System altered.
BBED> set file 10 block 151
FILE# 10
BLOCK# 151
BBED> p chkval_kcbh
ub2 chkval_kcbh @16 0xc428
BBED> sum
Check value for File 10, Block 151:
current = 0xc428, required = 0xc428 ###当前的checksum=0xc428，请求的checksum也是=0xc428，二者一致
--用dd命令导出10号文件的151号块
[oracle@DSI ~]$ dd if=/u01/app/oracle/oradata/orcl/yhqt01.dbf of=/tmp/yhqt01.dd count=1 skip=151 bs=8192
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 8.8344e-05 s, 92.7 MB/s
[oracle@DSI ~]$ sz /tmp/yhqt01.dd
--sz到windows下，用editplus工具打开（十六进制）--用UE工具能修改，editplus好像只能看不能改
现在我们将将ID为1的那条记录的ID值由1改为2，即将C1 02改成C1 03
YHQT@ orcl >select dump(1,16) from dual;
DUMP(1,16)
-----------------
Typ=2 Len=2: c1,2--1十六进制对应c102
修改之后上传到linux，用dd
[oracle@DSI ~]$ dd if=/home/oracle/yhqt01.dd of=/u01/app/oracle/oradata/orcl/yhqt01.dbf bs=8192 seek=151 count=1 conv=notrunc
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 0.000101711 s, 80.5 MB/s
重启db
SYS@ orcl >conn yhqt/yhqt
Connected.
YHQT@ orcl >select * from yhqtest_3;
select * from yhqtest_3
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 10, block # 151)
ORA-01110: data file 10: '/u01/app/oracle/oradata/orcl/yhqt01.dbf'
查看alertlog
Hex dump of (file 10, block 151) in trace file /u01/app/oracle/diag/rdbms/orcl/orcl/incident/incdir_64960/orcl_m000_3145_i64960_a.trc
Corrupt block relative dba: 0x02800097 (file 10, block 151)
Bad check value found during validation
Data in bad block:
type: 6 format: 2 rdba: 0x02800097
last change scn: 0x0000.009e57b3 seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x57b30601
check value in block header: 0xc428 >>>块头记录的checksum值是0xc428
computed block checksum: 0x1 >>>oracle这里做异或操作后的checksum值是01
Reread of blocknum=151, file=/u01/app/oracle/oradata/orcl/yhqt01.dbf. found same corrupt data
怎样计算出正确的checksum值（cont..）
BBED> set file 10 block 151
FILE# 10
BLOCK# 151
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl/yhqt01.dbf
BLOCK = 151
Block 151 is corrupt
Corrupt block relative dba: 0x02800097 (file 0, block 151)
Bad check value found during verification
Data in bad block:
type: 6 format: 2 rdba: 0x02800097
last change scn: 0x0000.009e57b3 seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x57b30601
check value in block header: 0xc428 ======>>>> a
computed block checksum: 0x1 =====>>>>>b
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 1
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED
BBED> sum
Check value for File 10, Block 151:
current = 0xc428, required = 0xc429
BBED> p chkval_kcbh
ub2 chkval_kcbh @16 0xc428
这里的换算规则 ,上面如果a、b两个值不同，则异或结果为1，如果a、b两个值相同，异或结果为0
checksum=0xc428 XOR 0x1
0xc428=c 4 2 8 =1100 0100 0010 1000
0x1=1 =0001
上面两个值进行异或
1100 0100 0010 1001=c429
BBED> modify /x c429 offset 16 ###将current的checksum值直接修改到请求后的值0xc429
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 151 Offsets: 16 to 527 Dba:0x02800097
BBED> sum apply
Check value for File 10, Block 151:
current = 0xc429, required = 0xc429
YHQT@ orcl >set pagesize 999
YHQT@ orcl >set linesize 999
YHQT@ orcl >select * from yhqtest_3;
ID NAME
---------- ------------------
2 yhq33333 >>>这里的id值之前是1，修改到了2 ，即C1 02改成C1 03
数据坏块相关参数-db_block_checksum
YHQT@ orcl >show parameter db_block_checksum NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_block_checksum string TYPICAL --OFF 关闭block checksum 机制,该参数即使设置为off，针对system表空间的block checksum机制也永远都是开启的，仅仅是针对非system表空间。 --TYPICAL 开启基本的block checksum机制，读取的时候检查checksum值，并在最后一个write时记录checksum值 --FULL 在typical模式的基础之上，在进行dml操作时候也会进行checksum比较，针对该block的操作，其对应的redo log在进行写入时也会进行checksum比较。 该参数注意是控制dbwn进程在将block写入到disk时，是否根据存储在block的byte大小进行估算一个checksum值， 并将其写入到data block的cache header中 该参数可以在很大程度上避免坏块的产生，但是会产生一定的额外资源消耗, 当设置typical时，会增加1~2%的资源消耗，当设置为full时，会增加4~5%的资源消耗
数据坏块相关参数- db_block_checking
YHQT@ orcl >show parameter db_block_checking NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_block_checking string FALSE --OFF 关闭block checking机制（注意仅仅是关于非system表空间),对于system表空间的block checking机制，是由参数_db_always_check_system_ts控制的，默认是true. --LOW 较低级别的block 校验检查，仅仅是block header.(注意是block 内容在内存中发生改变时) --MEDIUM 除包含low级别的校验外，还包括其他的所有非IOT表 block,即我们普通的堆table 数据块. --FULL 除包含medium级别的检查外，还包括所有的索引块 SQL> alter system set db_block_checking=FULL; SQL> alter system set db_block_checksum=FULL;
4.The block is misplaced
行锁错位的模拟
BBED> set file 10 block 151
FILE# 10
BLOCK# 151
BBED> p *kdbr
rowdata[0]
----------
ub1 rowdata[0] @8173 0x2c
BBED> x/ rnccc
rowdata[0] @8173
----------
flag@8173: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8174: 0x01 --->>>行锁
cols@8175: 2
col 0[2] @8176: 2 ---记录内容
col 1[8] @8179: yhq33333
BBED> modify /x 00 offset 8174
File: /u01/app/oracle/oradata/orcl/yhqt01.dbf (10)
Block: 151 Offsets: 8174 to 8191 Dba:0x02800097
------------------------------------------------------------------------
000202c1 03087968 71333333 33330106 b357
<32 bytes per line>
BBED> sum apply
Check value for File 10, Block 151:
current = 0xc428, required = 0xc428
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/orcl/yhqt01.dbf
BLOCK = 151
Block Checking: DBA = 41943191, Block Type = KTB-managed data block
data header at 0x926864
kdbchk: xaction header lock count mismatch -----报错
trans=1 ilk=1 nlo=0
Block 151 failed with check code 6108
DBVERIFY - Verification complete
Total Blocks Examined : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing (Data) : 1
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED
5.Zeroed out blocks/ORA-8103模拟
YHQT@ orcl >create table yhqtest_4(id int,name varchar2(100));
Table created.
begin
for i in 1 .. 5000 loop
insert into yhqtest_4 values(i,'yhq'||i);
commit;
end loop;
end;
/
YHQT@ orcl >SELECT owner, segment_name, EXTENT_ID, FILE_ID, BLOCK_ID, BLOCKS
FROM dba_extents
WHERE segment_name='YHQTEST_4' AND owner='YHQT'; 2 3
OWNER SEGMENT_NAME EXTENT_ID FILE_ID BLOCK_ID BLOCKS
------------------------------ ------------------------------- ---------- ---------- ---------- ----------
YHQT YHQTEST_4 0 10 152 8
YHQT YHQTEST_4 1 10 160 8
YHQT@ orcl >SELECT DISTINCT dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) blk#
FROM YHQTEST_4 ORDER BY 1,2; 2
FILE# BLK#
---------- ----------
10 155
10 156
10 157
10 158
10 159
10 160
10 161
10 163
10 164
10 165
10 166
10 167
12 rows selected.
YHQT@ orcl >conn / as sysdba
Connected.
SYS@ orcl >shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
使用dd命令
[oracle@DSI ~]$ dd if=/dev/zero of=/u01/app/oracle/oradata/orcl/yhqt01.dbf bs=8192 seek=160 count=1 conv=notrunc
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 9.5966e-05 s, 85.4 MB/s
SYS@ orcl >startup
YHQT@ orcl >select count(*) from yhqtest_4;
select count(*) from yhqtest_4
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 10, block # 160)
ORA-01110: data file 10: '/u01/app/oracle/oradata/orcl/yhqt01.dbf'
---坏块检查
YHQT@ orcl >select * from v$database_block_corruption;
FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
10 135 1 0 FRACTURED
10 143 1 0 FRACTURED
10 160 1 0 ALL ZERO
RMAN> backup validate datafile 10;
Starting backup at 12-JUL-19
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=145 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00010 name=/u01/app/oracle/oradata/orcl/yhqt01.dbf
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
List of Datafiles
=================
File Status Marked Corrupt Empty Blocks Blocks Examined High SCN
---- ------ -------------- ------------ --------------- ----------
10 FAILED 0 6233 6400 10394764
File Name: /u01/app/oracle/oradata/orcl/yhqt01.dbf
Block Type Blocks Failing Blocks Processed
---------- -------------- ----------------
Data 2 27
Index 0 0
Other 1 140
validate found one or more corrupt blocks
See trace file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_4271.trc for details
Finished backup at 12-JUL-19
[oracle@DSI ~]$ dbv file=/u01/app/oracle/oradata/orcl/yhqt01.dbf
DBVERIFY: Release 11.2.0.4.0 - Production on Fri Jul 12 16:45:43 2019
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
DBVERIFY - Verification starting : FILE = /u01/app/oracle/oradata/orcl/yhqt01.dbf
Page 135 is influx - most likely media corrupt
Corrupt block relative dba: 0x02800087 (file 10, block 135)
Fractured block found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x02800087
last change scn: 0x0000.009e4d78 seq: 0xff flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x4d780601
check value in block header: 0xf406
computed block checksum: 0x0
Page 143 is influx - most likely media corrupt
Corrupt block relative dba: 0x0280008f (file 10, block 143)
Fractured block found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x0280008f
last change scn: 0x0000.009e53f5 seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x54f50601
check value in block header: 0x46ca
computed block checksum: 0x0
Block Checking: DBA = 41943191, Block Type = KTB-managed data block
data header at 0x7fdde45ab064
kdbchk: xaction header lock count mismatch
trans=1 ilk=1 nlo=0
Page 151 failed with check code 6108
Page 160 is marked corrupt
Corrupt block relative dba: 0x028000a0 (file 10, block 160)
Completely zero block found during dbv:
DBVERIFY - Verification complete
Total Pages Examined : 6400
Total Pages Processed (Data) : 49
Total Pages Failing (Data) : 1
Total Pages Processed (Index): 0
Total Pages Failing (Index): 0
Total Pages Processed (Other): 145
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 6203
Total Pages Marked Corrupt : 3
Total Pages Influx : 2
Total Pages Encrypted : 0
Highest block SCN : 10396346 (0.10396346)
--rman修复，没有备份是不行的
RMAN> run {blockrecover datafile 10 block 143;}
Starting recover at 12-JUL-19
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 07/12/2019 16:33:16
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 10 found to restore
--修复
YHQT@ orcl >conn / as sysdba
Connected.
SYS@ orcl >alter session set db_file_multiblock_read_count=1;
Session altered.
SYS@ orcl >execute DBMS_REPAIR.SKIP_CORRUPT_BLOCKS('YHQT','YHQTEST_4');
PL/SQL procedure successfully completed.
SYS@ orcl >create table YHQT.YHQTEST_4_new as select * from YHQT.YHQTEST_4;
Table created.
SYS@ orcl >select count(*) from yhqt.yhqtest_4_new;
COUNT(*)
----------
4573
SYS@ orcl >select count(*) from yhqt.yhqtest_4;
COUNT(*)
----------
4573
下一篇介绍逻辑坏块以及坏块的恢复