标签归档：_ALLOW_RESETLOGS_CORRUPTION

不当使用_allow_resetlogs_corruption参数引起ORA-600 2662错误

发表于 2025 年 2 月 22 日 由 惜分飞

有一个数据库由于机房掉电,导致数据库无法启动,由于不当恢复导致open过程报ORA-600 2662等错误客户无法自行解决,让我们协助.幸运的是客户对现场做了备份,我接手恢复之后,让客户还原现场,然后进行恢复,比较顺利的直接open数据库,实现数据0丢失原库直接可用,避免了一次因为不当操作而引起少量数据丢失的风险,和业务的快速恢复(避免的因为强制拉库引起的不一致性问题而要做数据库逻辑迁移).通过日志回顾第一次现场恢复经历
最初故障数据库mount报错

SQL> startup mount pfile='d:/pfile.txt'
ORACLE 例程已经启动。

Total System Global Area 1071333376 bytes
Fixed Size                  1375792 bytes
Variable Size             754975184 bytes
Database Buffers          310378496 bytes
Redo Buffers                4603904 bytes
ORA-03113: 通信通道的文件结尾
进程 ID: 964
会话 ID: 1145 序列号: 1

无法mount,大部分情况是由于控制文件损坏,然后客户选择了重建controlfile

Thu Feb 20 10:20:45 2025
Successful mount of redo thread 1, with mount id 1721384698
Completed: CREATE CONTROLFILE REUSE DATABASE "ORCL" RESETLOGS ARCHIVELOG
MAXLOGFILES 32
MAXLOGMEMBERS 2
MAXDATAFILES 254
MAXINSTANCES 1
MAXLOGHISTORY 226
LOGFILE
GROUP 1 'D:\app\Administrator\oradata\orcl\redo01.log' size 50M,
GROUP 2 'D:\app\Administrator\oradata\orcl\redo02.log' size 50M,
GROUP 3 'D:\app\Administrator\oradata\orcl\redo03.log' size 50M
DATAFILE
'D:\app\Administrator\oradata\orcl\XFF.DBF',
'D:\app\Administrator\oradata\orcl\XIFENFEI.DBF',
'D:\app\Administrator\oradata\orcl\SYSAUX01.DBF',
'D:\app\Administrator\oradata\orcl\SYSTEM01.DBF',
'D:\app\Administrator\oradata\orcl\UNDOTBS01.DBF',
'D:\app\Administrator\oradata\orcl\USERS01.DBF'
CHARACTER SET ZHS16GBK

重建ctl使用了resetlogs模式,然后下一步客户进行恢复使用命令为:ALTER DATABASE RECOVER DATABASE UNTIL CANCEL USING BACKUP CONTROLFILE 

Thu Feb 20 10:22:05 2025
ALTER DATABASE RECOVER  DATABASE UNTIL CANCEL USING BACKUP CONTROLFILE  
Media Recovery Start
 started logmerger process
Thu Feb 20 10:22:05 2025
WARNING! Recovering data file 1 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
WARNING! Recovering data file 2 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
WARNING! Recovering data file 3 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
WARNING! Recovering data file 4 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
WARNING! Recovering data file 5 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
WARNING! Recovering data file 6 from a fuzzy file. If not the current file
it might be an online backup taken without entering the begin backup command.
Parallel Media Recovery started with 4 slaves
ORA-279 signalled during: ALTER DATABASE RECOVER  DATABASE UNTIL CANCEL USING BACKUP CONTROLFILE  ...
ALTER DATABASE RECOVER    CONTINUE DEFAULT  
Media Recovery Log D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC
Errors with log D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_pr00_3044.trc:
ORA-00308: cannot open archived log 
        'D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC'
ORA-27041: unable to open file
OSD-04002: 无法打开文件
O/S-Error: (OS 2) 系统找不到指定的文件。
ORA-308 signalled during: ALTER DATABASE RECOVER    CONTINUE DEFAULT  ...
ALTER DATABASE RECOVER    CONTINUE DEFAULT  
Media Recovery Log D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC
Errors with log D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_pr00_3044.trc:
ORA-00308: cannot open archived log 
        'D:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2025_02_20\O1_MF_1_9087_%U_.ARC'
ORA-27041: unable to open file
OSD-04002: 无法打开文件
O/S-Error: (OS 2) 系统找不到指定的文件。
ORA-308 signalled during: ALTER DATABASE RECOVER    CONTINUE DEFAULT  ...
ALTER DATABASE RECOVER CANCEL 
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_pr00_3044.trc:
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: 'D:\APP\ADMINISTRATOR\ORADATA\ORCL\SYSTEM01.DBF'
ORA-10879 signalled during: ALTER DATABASE RECOVER CANCEL ...

直接提示需要找归档日志seq为9087的,但是由于该库为非归档模式,客户直接输入了auto,无法找到对应的日志.然后尝试直接resetlogs打开库

Thu Feb 20 10:22:58 2025
ALTER DATABASE OPEN RESETLOGS
ORA-1194 signalled during: ALTER DATABASE OPEN RESETLOGS...
ALTER DATABASE OPEN
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_4836.trc:
ORA-01589: ??????????? RESETLOGS ? NORESETLOGS ??
ORA-1589 signalled during: ALTER DATABASE OPEN...
ALTER DATABASE OPEN RESETLOGS
ORA-1194 signalled during: ALTER DATABASE OPEN RESETLOGS...

由于数据文件不一致(前面recover没有成功),导致直接reseltogs方式打开库失败,然后设置一些参数

Thu Feb 20 10:27:24 2025
ALTER SYSTEM SET _allow_error_simulation=TRUE SCOPE=SPFILE;
ALTER SYSTEM SET _allow_terminal_recovery_corruption=TRUE SCOPE=SPFILE;
Thu Feb 20 10:27:38 2025
ALTER SYSTEM SET _allow_resetlogs_corruption=TRUE SCOPE=SPFILE;

重启库之后强制拉库

Completed: alter database mount
Thu Feb 20 10:29:08 2025
alter database open resetlogs
RESETLOGS is being done without consistancy checks. This may result
in a corrupted database. The database should be recreated.
Thu Feb 20 10:29:19 2025
Archived Log entry 1 added for thread 1 sequence 9088 ID 0x5d904d0a dest 1:
Archived Log entry 2 added for thread 1 sequence 9086 ID 0x5d904d0a dest 1:
Thu Feb 20 10:29:31 2025
Archived Log entry 3 added for thread 1 sequence 9087 ID 0x5d904d0a dest 1:
RESETLOGS after incomplete recovery UNTIL CHANGE 223770120
Thu Feb 20 10:29:38 2025
Setting recovery target incarnation to 2
Thu Feb 20 10:29:39 2025
Assigning activation ID 1721340650 (0x669992ea)
LGWR: STARTING ARCH PROCESSES
Thu Feb 20 10:29:39 2025
ARC0 started with pid=20, OS id=2924 
ARC0: Archival started
LGWR: STARTING ARCH PROCESSES COMPLETE
ARC0: STARTING ARCH PROCESSES
Thu Feb 20 10:29:40 2025
ARC1 started with pid=21, OS id=1832 
Thu Feb 20 10:29:40 2025
ARC2 started with pid=22, OS id=3668 
ARC1: Archival started
Thu Feb 20 10:29:40 2025
ARC3 started with pid=23, OS id=5104 
ARC2: Archival started
ARC1: Becoming the 'no FAL' ARCH
ARC1: Becoming the 'no SRL' ARCH
ARC2: Becoming the heartbeat ARCH
Thread 1 opened at log sequence 1
  Current log# 1 seq# 1 mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG
Successful open of redo thread 1
Thu Feb 20 10:29:41 2025
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Thu Feb 20 10:29:41 2025
SMON: enabling cache recovery
ARC3: Archival started
ARC0: STARTING ARCH PROCESSES COMPLETE
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_1652.trc  (incident=1006385):
ORA-00600: ??????, ??: [2662], [0], [223770128], [0], [223811777], [12583040], [], [], [], [], [], []
Incident details in: d:\app\administrator\diag\rdbms\orcl\orcl\incident\incdir_1006385\orcl_ora_1652_i1006385.trc
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_1652.trc:
ORA-00600: ??????, ??: [2662], [0], [223770128], [0], [223811777], [12583040], [], [], [], [], [], []
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_1652.trc:
ORA-00600: ??????, ??: [2662], [0], [223770128], [0], [223811777], [12583040], [], [], [], [], [], []
Error 600 happened during db open, shutting down database
USER (ospid: 1652): terminating the instance due to error 600
Instance terminated by USER, pid = 1652

数据库报ORA-600 2662错误,导致强制拉库失败.
后面客户进行了一系列折腾,导致出现其他错误,比如:
ORA-01595/ORA-600 4194

Fri Feb 21 04:52:19 2025
Trace dumping is performing id=[cdmp_20250221045219]
Doing block recovery for file 3 block 472
Resuming block recovery (PMON) for file 3 block 472
Block recovery from logseq 2, block 51 to scn 223837038
Recovery of Online Redo Log: Thread 1 Group 2 Seq 2 Reading mem 0
  Mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG
Block recovery stopped at EOT rba 2.54.16
Block recovery completed at rba 2.54.16, scn 0.223837035
Doing block recovery for file 3 block 144
Resuming block recovery (PMON) for file 3 block 144
Block recovery from logseq 2, block 51 to scn 223837033
Recovery of Online Redo Log: Thread 1 Group 2 Seq 2 Reading mem 0
  Mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG
Block recovery completed at rba 2.52.16, scn 0.223837034
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_smon_2124.trc:
ORA-01595: error freeing extent (3) of rollback segment (2))
ORA-00600: internal error code, arguments: [4194], [], [

ORA-600 2256/ORA-600 4194

Fri Feb 21 05:02:43 2025
SMON: enabling cache recovery
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_2184.trc  (incident=1134285):
ORA-00600: 内部错误代码, 参数: [2256], [0], [1073741824], [0], [1073761870], [], [], [], [], [], [], []
Incident details in: d:\app\administrator\diag\rdbms\orcl\orcl\incident\incdir_1134285\orcl_ora_2184_i1134285.trc
Successfully onlined Undo Tablespace 2.
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
SMON: enabling tx recovery
*********************************************************************
WARNING: The following temporary tablespaces contain no files.
         This condition can occur when a backup controlfile has
         been restored.  It may be necessary to add files to these
         tablespaces.  That can be done using the SQL statement:
 
         ALTER TABLESPACE <tablespace_name> ADD TEMPFILE
 
         Alternatively, if these temporary tablespaces are no longer
         needed, then they can be dropped.
           Empty temporary tablespace: TEMP
*********************************************************************
Database Characterset is ZHS16GBK
No Resource Manager plan active
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_smon_648.trc  (incident=1134237):
ORA-00600: internal error code, arguments: [4194], [], [
Incident details in: d:\app\administrator\diag\rdbms\orcl\orcl\incident\incdir_1134237\orcl_smon_648_i1134237.trc
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_ora_2184.trc  (incident=1134286):
ORA-00600: 内部错误代码, 参数: [4194], [0], [
Incident details in: d:\app\administrator\diag\rdbms\orcl\orcl\incident\incdir_1134286\orcl_ora_2184_i1134286.trc

ORA-600 3712

Fri Feb 21 05:24:51 2025
Assigning activation ID 1721440698 (0x669b19ba)
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_lgwr_3620.trc  (incident=1150206):
ORA-00600: internal error code, arguments: [3712], [1], [1], [3584], [3], [3584], [1], [], [], [], [], []
Incident details in: d:\app\administrator\diag\rdbms\orcl\orcl\incident\incdir_1150206\orcl_lgwr_3620_i1150206.trc
Errors in file d:\app\administrator\diag\rdbms\orcl\orcl\trace\orcl_lgwr_3620.trc:
ORA-00600: internal error code, arguments: [3712], [1], [1], [3584], [3], [3584], [1], [], [], [], [], []
LGWR (ospid: 3620): terminating the instance due to error 470

基于客户本身库不大,而且在操作之前备份了现场,然后客户还原故障现场备份,我开始接手恢复
重建控制文件

Fri Feb 21 21:57:19 2025
Successful mount of redo thread 1, with mount id 1721495486
Completed: CREATE CONTROLFILE REUSE DATABASE "ORCL" NORESETLOGS  NOARCHIVELOG
       MAXLOGFILES 50
       MAXLOGMEMBERS 5
       MAXDATAFILES 5000
       MAXINSTANCES 8
       MAXLOGHISTORY 2920
LOGFILE
       group 1   'D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG' size 50M,
       group 3   'D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO03.LOG' size 50M,
       group 2   'D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG' size 50M
DATAFILE
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\SYSTEM01.DBF',
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\SYSAUX01.DBF',
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\UNDOTBS01.DBF',
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\USERS01.DBF',
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\XIFENFEI.DBF',
        'D:\APP\ADMINISTRATOR\ORADATA\ORCL\XFF.DBF'
CHARACTER SET  ZHS16GBK

这里重建控制文件使用的是noresetlogs模式,然后尝试recover database

ALTER DATABASE RECOVER  database  
Media Recovery Start
 started logmerger process
Parallel Media Recovery started with 4 slaves
Fri Feb 21 21:57:25 2025
Recovery of Online Redo Log: Thread 1 Group 3 Seq 9087 Reading mem 0
  Mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO03.LOG
Recovery of Online Redo Log: Thread 1 Group 1 Seq 9088 Reading mem 0
  Mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG
Fri Feb 21 21:57:30 2025
Completed: ALTER DATABASE RECOVER  database

数据库直接recover成功,然后尝试正常open库

Fri Feb 21 21:58:17 2025
alter database open
Beginning crash recovery of 1 threads
 parallel recovery started with 3 processes
Started redo scan
Completed redo scan
 read 12019 KB redo, 0 data blocks need recovery
Started redo application at
 Thread 1: logseq 9088, block 2, scn 223805802
Recovery of Online Redo Log: Thread 1 Group 1 Seq 9088 Reading mem 0
  Mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG
Completed redo application of 0.00MB
Completed crash recovery at
 Thread 1: logseq 9088, block 24040, scn 223836931
 0 data blocks read, 0 data blocks written, 12019 redo k-bytes read
Fri Feb 21 21:58:17 2025
Thread 1 advanced to log sequence 9089 (thread open)
Thread 1 opened at log sequence 9089
  Current log# 2 seq# 9089 mem# 0: D:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG
Successful open of redo thread 1
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Fri Feb 21 21:58:17 2025
SMON: enabling cache recovery
Dictionary check beginning
Tablespace 'TEMP' #3 found in data dictionary,
but not in the controlfile. Adding to controlfile.
Dictionary check complete
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
SMON: enabling tx recovery
*********************************************************************
WARNING: The following temporary tablespaces contain no files.
         This condition can occur when a backup controlfile has
         been restored.  It may be necessary to add files to these
         tablespaces.  That can be done using the SQL statement:
 
         ALTER TABLESPACE <tablespace_name> ADD TEMPFILE
 
         Alternatively, if these temporary tablespaces are no longer
         needed, then they can be dropped.
           Empty temporary tablespace: TEMP
*********************************************************************
Database Characterset is ZHS16GBK
No Resource Manager plan active
**********************************************************
WARNING: Files may exists in db_recovery_file_dest
that are not known to the database. Use the RMAN command
CATALOG RECOVERY AREA to re-catalog any such files.
If files cannot be cataloged, then manually delete them
using OS command.
One of the following events caused this:
1. A backup controlfile was restored.
2. A standby controlfile was restored.
3. The controlfile was re-created.
4. db_recovery_file_dest had previously been enabled and
   then disabled.
**********************************************************
replication_dependency_tracking turned off (no async multimaster replication found)
Starting background process QMNC
Fri Feb 21 21:58:20 2025
QMNC started with pid=22, OS id=524 
LOGSTDBY: Validating controlfile with logical metadata
LOGSTDBY: Validation complete
Completed: alter database open

数据库完美打开,然后增加tempfile,检查/导出数据均没有任何问题,业务可以直接使用本库,不用逻辑迁移
其实这是一个比较小的故障,由于断电导致控制文件损坏,然后客户重建控制文件使用resetlogs方式,然后recover没有正确指定redo,来完成数据库实例恢复,直接使用_allow_resetlogs_corruption参数强制拉库,然后出现了ORA-600 2662/ORA-600 4194/ORA-600 2256等大家熟悉的错误.这个库不大,也做了故障现场保护,如果是一个10T以上大库,发生这样的故障,后果还是比较麻烦的(库可以打开,但是redo中的数据肯定丢失导致数据库不一致,后续可能有很多不一致性问题,可能涉及逻辑迁移),增加企业业务不可用时间成本和业务数据丢失风险,再次提醒对于Oracle隐含参数,还是需要慎重,做好专业的评估再使用.

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ORA-600 2662

发表于 2016 年 8 月 1 日 由 惜分飞

在数据库恢复中,ORA-600 2662我想是很多人都非常熟悉的错误,下文是对于该错误的一些解释
ORA-600 2662解释说明

ERROR:              

  Format: ORA-600 [2662] [a] [b] {c} [d] [e]
 
VERSIONS:
  versions 6.0 to 12.1
 
DESCRIPTION:

  A data block SCN is ahead of the current SCN.

  The ORA-600 [2662] occurs when an SCN is compared to the dependent SCN 
  stored in a UGA variable.

  If the SCN is less than the dependent SCN then we signal the ORA-600 [2662]
  internal error.

ARGUMENTS:
  Arg [a]  Current SCN WRAP
  Arg [b]  Current SCN BASE
  Arg {c}  dependent SCN WRAP
  Arg [d]  dependent SCN BASE 
  Arg [e]  Where present this is the DBA where the dependent SCN came from.

出现ORA-600 2662可能的原因

  (1) doing an open resetlogs with _ALLOW_RESETLOGS_CORRUPTION enabled    
  (2) a hardware problem, like a faulty controller, resulting in a failed 
      write to the control file or the redo logs     
  (3) restoring parts of the database from backup and not doing the 
      appropriate recovery     
  (4) restoring a control file and not doing a RECOVER DATABASE USING BACKUP 
      CONTROLFILE     
  (5) having _DISABLE_LOGGING set during crash recovery                      
  (6) problems with the DLM in a parallel server environment      
  (7) a bug

ORA-600 2662解决方法

   (1) if the SCNs in the error are very close, attempting a startup several 
       times will bump up the dscn every time we open the database even if 
       open fails. The database will open when dscn=scn.
      
   (2)You can bump the SCN either on open or while the database is open 
      using Event:ADJUST_SCN 
      Be aware that you should rebuild the database if you use this
      option.
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_ALLOW_RESETLOGS_CORRUPTION

发表于 2016 年 7 月 31 日 由 惜分飞

我相信_ALLOW_RESETLOGS_CORRUPTION 这个参数一定很多人都熟悉,是redo异常恢复的杀手锏之一,以下文章是来自官方的解释

DB_Parameter _ALLOW_RESETLOGS_CORRUPTION 
========================================
 
This documentation has been prepared avoiding the mention of the complex 
structures from the code and to simply give an insight to the 'damage it could 
cause'.  The usage of this parameter leads to an in-consistent Database with no 
other alternative but to rebuild the complete Database.  This parameter could 
be used when we realize that there are no stardard options available and are 
convinced that the customer understands the implications of using the Oracle's 
secret parameter.  The factors to be considered are ;-- 
 
1. Customer does not have a good backup. 
2. A lot of time and money has been invested after the last good backup and     
   there is no possibility for reproduction of the lost data. 
3. The customer has to be ready to export the full database and import it     
   back after creating a new one. 
4. There is no 100% guarantee that by using this parameter the database would 
   come up. 
5. Oracle does not support the database after using this parameter for        
   recovery.    
6. ALL OPTIONS including the ones mentioned in the action part of the error   
   message have been tried. 
 
 

 
By setting _ALLOW_RESETLOGS_CORRUPTION=TRUE, certain consistency checks are 
SKIPPED during database open stage.  This basically means it does not check 
the datafile headers as to what the status was before the shutdown and how it 
was shutdown.  The following cases mention few of the checks that were skipped. 
 
Case-I 
------ 
Verification that the datafile present has not been restored from a BACKUP 
taken before the database was opened successfully by using RESETLOGS.   

ORA-01190: control file or data file %s is from before the last RESETLOGS
    Cause: Attempting to use a data file when the log reset information in  
           the file does not match the control file.  Either the data file or  
           the control file is a backup that was made before the most recent 
           ALTER DATABASE OPEN RESETLOGS. 
   Action: Restore file from a more recent backup. 

 
Case-II 
------- 
Verification that the status bit of the datafile is not in a FUZZY state. 
The datafile could be in this state due to the database going down when the  
 - Datafile was on-line and open 
 - Datafile was not closed cleanly (maybe due to OS). 

ORA-01194: file %s needs more recovery to be consistent 
    Cause: An incomplete recover session was started, but an insufficient 
           number of logs were applied to make the file consistent.  The  
           reported file was not closed cleanly when it was last opened by 
           the database.  It must be recovered to a time when it was not  
           being updated.  The most likely cause of this error is forgetting 
           to restore the file from a backup before doing incomplete  
           recovery. 
   Action: Either apply more logs until the file is consistent or restore the 
           file from an older backup and repeat recovery. 
 

Case-III 
-------- 
Verification that the COMPLETE recover strategies have been applied for 
recovering the datafile and not any of the INCOMPLETE recovery options.  
Basically because the complete recovery is one in which we even apply the 
ON-LINE redo log files and open the DB without reseting the logs. 

ORA-01113: file '%s' needs media recovery starting at log sequence # %s 
    Cause: An attempt was made to open a database file that is in need of  
           media recovery. 
   Action: First apply media recovery to the file. 

 
Case-IV 
------- 
Verification that the datafile has been recovered through an END BACKUP if the 
control file indicates that it was in backup mode. 
This is useful when the DB has crashed while in hot backup mode and we lost 
all log files in DB version's less than V7.2. 

ORA-01195: on-line backup of file %s needs more recovery to be consistent" 
    Cause: An incomplete recovery session was started, but an insufficient  
           number of logs were applied to make the file consistent.  The 
           reported file is an on-line backup which must be recovered to the 
           time the backup ended. 
   Action: Either apply more logs until the file is consistent or resotre 
          the database files from an older backup and repeat recovery. 
 
In version 7.2, we could simply issue the ALTER DATABASE DATAFILE xxxx END 
BACKUP statement and proceed with the recovery.  But again to issue this 
statement, we need to have the ON-LINE redo logs or else we still are forced to
use this parameter. 
 

Case-V 
------ 
Verification that the data file status is not still in (0x10) MEDIA recovery 
FUZZY. 
When recovery is started, a flag is set in the datafile header status flag to 
indicate that the file is presently in media recovery.  This is reset when 
recovery is completed and at times when it has not been reset we are forced to 
use this paramter. 

ORA-01196: file %s is inconsistent due to a failed media recovery session 
    Cause: The file was being recovered but the recovery did not terminate 
           normally.  This left the file in an inconsistent state.  No more  
           recovery was successfully completed on this file. 
   Action: Either apply more logs until the file is consistent or restore the 
           backup again and repeat recovery. 
 
 
Case-VI 
------- 
Verification that the datafile has been restored form a proper backup to 
correspond with the log files.  This situation could happen when we have 
decided that the data file is invalid since its SCN is ahead of the last 
applied logs SCN but it has not failed on one of the ABOVE CHECKS. 

ORA-01152: file '%s' was not restored from a sufficientluy old backup" 
    Cause: A manual recovery session was started, but an insufficient number 
           of logs were applied to make the database consistent.  This file is 
           still in the future of the last log applied.  Note that this  
           mistake can not always be caught. 
   Action: Either apply more logs until the database is consistent or 
           restore the database file from an older backup and repeat  
           recovery.

使用_ALLOW_RESETLOGS_CORRUPTION 参数需谨慎,因为该参数可能导致数据库逻辑不一致,甚至可能把本来很简单的一个恢复弄的非常复杂甚至不可恢复的后果,建议在oracle support支持下使用.另外使用该参数resetlogs库之后,强烈建议通过逻辑方式重建库

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