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关于blockrecover 解决坏块相关测试与总结

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悲剧的客户因为IBM p系列小机更换电源导致主机直接掉电,起来后发现数据库出现不少坏块,而且还有部分坏块中含有回滚事务,导致alert日志一直报smon回滚遇到坏块错误，该数据库版本是9.2.0.8 RAC,根据客户的备份情况,为了减少对业务的影响,决定使用blockrecover对其处理.这里通过10g数据库大概模拟出现含事务坏块的情况以及处理过程,重现了我们在处理的时候不确定的一些知识.

创建测试表

SQL> select * from v$version;
 
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
 
SQL> conn /as sysdba
Connected.
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     231
Next log sequence to archive   233
Current log sequence           233
SQL> conn chf/xifenfei
Connected.
SQL> create table t_xifenfei
  2  as
  3  select * from dba_objects where rownum<10;
 
Table created.
 
SQL> select rowid,
  2  dbms_rowid.rowid_relative_fno(rowid) rel_fno,
  3  dbms_rowid.rowid_block_number(rowid) block
  4  from chf.t_xifenfei;
 
ROWID                 REL_FNO      BLOCK
------------------ ---------- ----------
AAANIqAAEAAAAAcAAA          4         28
AAANIqAAEAAAAAcAAB          4         28
AAANIqAAEAAAAAcAAC          4         28
AAANIqAAEAAAAAcAAD          4         28
AAANIqAAEAAAAAcAAE          4         28
AAANIqAAEAAAAAcAAF          4         28
AAANIqAAEAAAAAcAAG          4         28
AAANIqAAEAAAAAcAAH          4         28
AAANIqAAEAAAAAcAAI          4         28
 
9 rows selected.

当前的seq是233(也就是说我在233归档上创建了t_xienfei表)

dbv检查block

[oracle@xifenfei ~]$ dbv file='/u01/oracle/oradata/XFF/users01.dbf'
 
DBVERIFY: Release 10.2.0.4.0 - Production on Sun Jan 20 22:16:16 2013
 
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
 
DBVERIFY - Verification starting : FILE = /u01/oracle/oradata/XFF/users01.dbf
 
DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 904
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 38
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 44
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 294
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Highest block SCN            : 3224018224 (2860.3224018224)

证明无任何坏块

切换归档

SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     233
Next log sequence to archive   235
Current log sequence           235

现在已经切换seq到235

rman备份我们需要测试block(file 4 block 28)对应的数据文件

RMAN>  backup datafile 4 format '/u01/oracle/oradata/xff_4.rman';

具体见:rman制造坏块,bbed修复坏块

模拟数据库进行其他操作

SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     235
Next log sequence to archive   237
Current log sequence           237
SQL> conn chf/xifenfei
Connected.
SQL> create table t_xff
  2  as
  3  select * from dba_objects;
 
Table created.
 
SQL> alter system switch logfile;
 
System altered.

主要是为了模拟对其他block操作,对于block 28的恢复影响

对block 28进行操作

SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     237
Next log sequence to archive   239
Current log sequence           239
SQL> update chf.t_xifenfei set object_name='www.xifenfei.com';
 
9 rows updated.
 
SQL> commit;
 
Commit complete.
 
SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> /
 
System altered.

在seq为239的时候对block 28进行了一次update操作

模拟其他业务操作

SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     240
Next log sequence to archive   242
Current log sequence           242
SQL> delete from chf.t_xff ;
 
50491 rows deleted.
 
SQL> commit;
 
Commit complete.
 
SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     242
Next log sequence to archive   244
Current log sequence           244
SQL>  alter system switch logfile;  
 
System altered.
 
SQL> /
 
System altered.

这里可以知道在seq为246的时候做了备份归档操作

备份归档操作

RMAN> backup archivelog all format '/u01/oracle/oradata/xff_arch_%U' delete input;

模拟继续操作

SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     248
Next log sequence to archive   250
Current log sequence           250
 
SQL> update chf.t_xifenfei set object_name='www.orasos.com' where rownum<5;
 
4 rows updated.

这里可以发现,在seq为250的时候我们再次对block 28进行了操作

使用rman制造坏块

RMAN> BLOCKRECOVER DATAFILE 4 block 28 clear;

dbv检查坏块

[oracle@xifenfei ~]$ dbv file='/u01/oracle/oradata/XFF/users01.dbf'
 
DBVERIFY: Release 10.2.0.4.0 - Production on Sun Jan 20 23:01:24 2013
 
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
 
DBVERIFY - Verification starting : FILE = /u01/oracle/oradata/XFF/users01.dbf
Page 28 is influx - most likely media corrupt
Corrupt block relative dba: 0x0100001c (file 4, block 28)
Fractured block found during dbv:
Data in bad block:
 type: 6 format: 2 rdba: 0x0100001c
 last change scn: 0x0b2c.c02ab081 seq: 0x1 flg: 0x04
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0xb0c4a6ea
 check value in block header: 0x393f
 computed block checksum: 0xc917
 
DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 903
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 38
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 47
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 291
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 1
Highest block SCN            : 3224022228 (2860.3224022228)

强制kill数据库

[oracle@xifenfei ~]$ ps -ef|grep pmon
oracle    9744  9638  0 23:03 pts/1    00:00:00 grep pmon
oracle   32156     1  0 14:17 ?        00:00:10 ora_pmon_XFF
[oracle@xifenfei ~]$ kill -9 32156
[oracle@xifenfei ~]$ ps -ef|grep pmon
oracle    9751  9638  0 23:03 pts/1    00:00:00 grep pmon

为了模拟含事务的block出现坏块

启动数据库

SQL> startup mount
ORACLE instance started.
 
Total System Global Area  306184192 bytes
Fixed Size                  1267164 bytes
Variable Size             109054500 bytes
Database Buffers          188743680 bytes
Redo Buffers                7118848 bytes
Database mounted.
SQL> ALTER DATABASE OPEN;
 
Database altered.

数据库启动正常

查询坏块

SQL> select count(*) from chf.t_xifenfei;
select count(*) from chf.t_xifenfei
                         *
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 28)
ORA-01110: data file 4: '/u01/oracle/oradata/XFF/users01.dbf'

alert日志

Sun Jan 20 23:04:37 2013
SMON: enabling tx recovery
Sun Jan 20 23:04:37 2013
Database Characterset is ZHS16GBK
Sun Jan 20 23:04:37 2013
Hex dump of (file 4, block 28) in trace file /u01/oracle/admin/XFF/bdump/xff_smon_9775.trc
Corrupt block relative dba: 0x0100001c (file 4, block 28)
Fractured block found during buffer read
Data in bad block:
 type: 6 format: 2 rdba: 0x0100001c
 last change scn: 0x0b2c.c02ab081 seq: 0x1 flg: 0x04
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0xb0c4a6ea
 check value in block header: 0x393f
 computed block checksum: 0xc917
Reread of rdba: 0x0100001c (file 4, block 28) found same corrupted data
ORACLE Instance XFF (pid = 8) - Error 1578 encountered while recovering transaction (9, 37) on object 53802.
Sun Jan 20 23:04:38 2013
Errors in file /u01/oracle/admin/XFF/bdump/xff_smon_9775.trc:
ORA-01578: ORACLE data block corrupted (file # 4, block # 28)
ORA-01110: data file 4: '/u01/oracle/oradata/XFF/users01.dbf'

通过试验步骤和alert日志可以发现因为block有事务,但是被标记为了坏块,所以smon无法回滚该事务,从而出现alert中类似提示

继续切换归档

SQL> alter system switch logfile;
 
System altered.
 
SQL> /
 
System altered.
 
SQL> /
 
System altered.
 
SQL> /
 
System altered.
 
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/oracle/oradata/XFF/archivelog
Oldest online log sequence     252
Next log sequence to archive   254
Current log sequence           254

移走归档

[oracle@xifenfei archivelog]$ ls -l
total 2224
-rw-r----- 1 oracle oinstall  360960 Jan 20 22:59 1_247_792679299.dbf
-rw-r----- 1 oracle oinstall    1024 Jan 20 22:59 1_248_792679299.dbf
-rw-r----- 1 oracle oinstall 1630208 Jan 20 23:04 1_249_792679299.dbf
-rw-r----- 1 oracle oinstall  249344 Jan 20 23:09 1_250_792679299.dbf
-rw-r----- 1 oracle oinstall    1024 Jan 20 23:09 1_251_792679299.dbf
-rw-r----- 1 oracle oinstall    4608 Jan 20 23:09 1_252_792679299.dbf
-rw-r----- 1 oracle oinstall    1024 Jan 20 23:09 1_253_792679299.dbf
[oracle@xifenfei archivelog]$ mkdir bak
[oracle@xifenfei archivelog]$ mv *.dbf bak
[oracle@xifenfei archivelog]$ ll
total 4
drwxr-xr-x 2 oracle oinstall 4096 Jan 20 23:11 bak

为了重现,当我们使用blockrecover恢复的时候,如果缺少归档会怎么样

尝试blockrecover

RMAN> BLOCKRECOVER DATAFILE 4 block 28;
 
Starting blockrecover at 20-JAN-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=135 devtype=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: sid=126 devtype=DISK
allocated channel: ORA_DISK_3
channel ORA_DISK_3: sid=125 devtype=DISK
allocated channel: ORA_DISK_4
channel ORA_DISK_4: sid=124 devtype=DISK
 
channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00004
channel ORA_DISK_1: reading from backup piece /u01/oracle/oradata/xff_4.rman
channel ORA_DISK_1: restored block(s) from backup piece 1
piece handle=/u01/oracle/oradata/xff_4.rman tag=TAG20130120T222333
channel ORA_DISK_1: block restore complete, elapsed time: 00:00:01
 
starting media recovery
 
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of blockrecover command at 01/20/2013 23:11:41
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of log thread 1 seq 253 lowscn 12286830510311 found to restore
RMAN-06025: no backup of log thread 1 seq 252 lowscn 12286830510307 found to restore
RMAN-06025: no backup of log thread 1 seq 251 lowscn 12286830510305 found to restore
RMAN-06025: no backup of log thread 1 seq 250 lowscn 12286830509979 found to restore
RMAN-06025: no backup of log thread 1 seq 249 lowscn 12286830489543 found to restore
RMAN-06025: no backup of log thread 1 seq 248 lowscn 12286830489541 found to restore
RMAN-06025: no backup of log thread 1 seq 247 lowscn 12286830489279 found to restore

alert日志记录

Sun Jan 20 23:11:38 2013
alter database recover datafile list clear
Sun Jan 20 23:11:38 2013
Completed: alter database recover datafile list clear
Sun Jan 20 23:11:38 2013
Starting block media recovery
Sun Jan 20 23:11:39 2013
Media Recovery Log /u01/oracle/oradata/XFF/archivelog/1_235_792679299.dbf
Sun Jan 20 23:11:41 2013
alter database recover cancel
Sun Jan 20 23:11:41 2013
Media Recovery Canceled
Completed: alter database recover cancel

blockrecover恢复途中或者异常终止,dbv检测

[oracle@xifenfei ~]$ dbv file=/u01/oracle/oradata/XFF/users01.dbf
 
DBVERIFY: Release 10.2.0.4.0 - Production on Sun Jan 20 23:18:29 2013
 
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
 
DBVERIFY - Verification starting : FILE = /u01/oracle/oradata/XFF/users01.dbf
Page 28 is marked corrupt
Corrupt block relative dba: 0x0100001c (file 4, block 28)
Bad check value found during dbv:
Data in bad block:
 type: 6 format: 2 rdba: 0x0100001c
 last change scn: 0x0b2c.c02b0248 seq: 0x1 flg: 0x04
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0x02480601
 check value in block header: 0x13fc
 computed block checksum: 0x663b
 
DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 903
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 38
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 47
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 291
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 0
Highest block SCN            : 3224022228 (2860.3224022228)

在blockrecover处理过程，或者处理失败的后,block依然是坏块，如果遇到这类情况,没有事务可以直接指定seq/scn/time的方法来恢复,如果有事务,需要指定恢复时间点过该事务的时间点,让smon能够正常回滚,从而使得smon进程正常工作

还原归档后继续测试

[oracle@xifenfei archivelog]$ mv bak/* ./
 
RMAN> BLOCKRECOVER DATAFILE 4 block 28;
 
starting media recovery
archive log thread 1 sequence 247 is already on disk as file /u01/oracle/oradata/XFF/archivelog/1_247_792679299.dbf
…………
media recovery complete, elapsed time: 00:00:01
Finished blockrecover at 20-JAN-13
 
[oracle@xifenfei ~]$ dbv file=/u01/oracle/oradata/XFF/users01.dbf
 
DBVERIFY: Release 10.2.0.4.0 - Production on Sun Jan 20 23:15:43 2013
 
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
 
DBVERIFY - Verification starting : FILE = /u01/oracle/oradata/XFF/users01.dbf
 
DBVERIFY - Verification complete
 
Total Pages Examined         : 1280
Total Pages Processed (Data) : 904
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 38
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 47
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 291
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Highest block SCN            : 3224023169 (2860.3224023169)

blockrecover处理alert日志

Sun Jan 20 23:15:01 2013
Media Recovery Log /u01/oracle/oradata/XFF/archivelog/1_250_792679299.dbf
Sun Jan 20 23:15:01 2013
Media Recovery Log /u01/oracle/oradata/XFF/archivelog/1_251_792679299.dbf
Sun Jan 20 23:15:01 2013
Recovery of Online Redo Log: Thread 1 Group 3 Seq 252 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo03.log
Sun Jan 20 23:15:01 2013
Recovery of Online Redo Log: Thread 1 Group 1 Seq 253 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo01.log
Sun Jan 20 23:15:01 2013
Recovery of Online Redo Log: Thread 1 Group 2 Seq 254 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo02.log
Sun Jan 20 23:15:02 2013
Completed block media recovery

补充说明

1.在9i中使用blockrecover会在Archive destination中生产block的备份文件,类似469_519791_3063_2442393528.bkd(file 469 block 519791),需要注意Archive destination目录结尾需要”/”,不然可能出现直接写入和该目录并列的Archive destination+blockrecover产生文件;10g中不生成该文件;如果该block在9i中未备份,也不会在生产相关文件,而是利用归档恢复.

2.blockrecover需要还原从该block从备份之后的所有归档(如果被备份起来需要还原出来),如果缺少归档可能导致恢复失败,包括基于scn/seq/time的等

3.blockrecover在执行过程中或者执行异常终止,该block依然是坏块,不会对其他block产生影响.在使用blockrecover出现异常终止后的block修复,在后续blog中提供解决方法

4.对于不含事务的坏块,如果数据允许丢失可以通过设置event跳过坏块(特殊block除外),然后重建对象;对于含event的block 坏块,建议使用blockrecover处理或者直接恢复数据文件,如果没有备份,考试使用event跳过事务回滚,然后屏蔽坏块处理

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文章信息

作者：惜分飞来源：惜分飞
标签： blockrecover
发布时间：2013-03-04 14:12:15

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