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