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_allow_resetlogs_corruption 的搜索结果
_ALLOW_RESETLOGS_CORRUPTION
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
发表在 Oracle备份恢复
标签为 ORA-01113, ORA-01152, ORA-01190, ORA-01194, ORA-01195, ORA-01196, _ALLOW_RESETLOGS_CORRUPTION
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使用_allow_resetlogs_corruption导致ORA-00704/ORA-01555故障
以前写过一篇乱用_allow_resetlogs_corruption参数导致悲剧的文章,昨天晚上又遇到一个朋友不谨慎使用_allow_resetlogs_corruption导致ORA-00704/ORA-01555故障
环境描述
系统环境:solaris
数据库版本:10.2.0.5.7
数据存储方式:ASM
数据量:15T以上
补充事宜:数据库SCN距离headroom只有54天
报ORA-00020错误,实例crash
数据库因为超过了系统的进程数,出现dbwn进程写数据文件异常
Sun Aug 25 16:00:41 CST 2013 Errors in file /opt/oracle/admin/orcl/bdump/orcl_dbw0_7490.trc: ORA-01148: 无法刷新数据文件 22 的文件大小 ORA-01110: 数据文件 22: '+DATA/orcl/datafile/index_jh.dbf' ORA-00020: 超出最大进程数 () Sun Aug 25 16:00:41 CST 2013 Errors in file /opt/oracle/admin/orcl/bdump/orcl_dbw0_7490.trc: ORA-01242: 数据文件出现介质故障: 数据库处于 NOARCHIVELOG 模式 ORA-01110: 数据文件 22: '+DATA/orcl/datafile/index_jh.dbf' Sun Aug 25 16:00:41 CST 2013 DBW0: terminating instance due to error 1242 Termination issued to instance processes. Waiting for the processes to exit Sun Aug 25 16:00:51 CST 2013 Instance termination failed to kill one or more processes Instance terminated by DBW0, pid = 7490
ORA-00600[kcbtema_10]
实例恢复出现ORA-00600: 内部错误代码, 参数: [kcbtema_10], [1], [], [], [], [], [], []
Sun Aug 25 19:19:23 CST 2013 ALTER DATABASE OPEN Sun Aug 25 19:19:38 CST 2013 Beginning crash recovery of 1 threads parallel recovery started with 16 processes Sun Aug 25 19:19:40 CST 2013 Started redo scan Sun Aug 25 19:20:07 CST 2013 Completed redo scan 12016413 redo blocks read, 93405 data blocks need recovery Sun Aug 25 19:20:19 CST 2013 Started redo application at Thread 1: logseq 53681, block 1091966 Sun Aug 25 19:20:19 CST 2013 Recovery of Online Redo Log: Thread 1 Group 1 Seq 53681 Reading mem 0 Mem# 0: +DATA/orcl/onlinelog/redo_1_1.log Mem# 1: +DATA/orcl/onlinelog/redo_1_2.log Sun Aug 25 19:20:21 CST 2013 Errors in file /opt/oracle/admin/orcl/bdump/orcl_p011_16944.trc: ORA-00600: 内部错误代码, 参数: [kcbtema_10], [1], [], [], [], [], [], [] Sun Aug 25 19:20:23 CST 2013 Errors in file /opt/oracle/admin/orcl/bdump/orcl_p011_16944.trc: ORA-00600: 内部错误代码, 参数: [kcbtema_10], [1], [], [], [], [], [], [] Sun Aug 25 19:20:23 CST 2013 Aborting crash recovery due to slave death, attempting serial crash recovery Sun Aug 25 19:20:23 CST 2013 Beginning crash recovery of 1 threads Sun Aug 25 19:20:23 CST 2013 Started redo scan Sun Aug 25 19:20:47 CST 2013 Completed redo scan 12016413 redo blocks read, 93405 data blocks need recovery Sun Aug 25 19:20:54 CST 2013 Started redo application at Thread 1: logseq 53681, block 1091966 Sun Aug 25 19:20:54 CST 2013 Recovery of Online Redo Log: Thread 1 Group 1 Seq 53681 Reading mem 0 Mem# 0: +DATA/orcl/onlinelog/redo_1_1.log Mem# 1: +DATA/orcl/onlinelog/redo_1_2.log Sun Aug 25 19:20:54 CST 2013 Errors in file /opt/oracle/admin/orcl/udump/orcl_ora_16751.trc: ORA-00600: 内部错误代码, 参数: [kcbtema_10], [1], [], [], [], [], [], [] Sun Aug 25 19:20:56 CST 2013 Aborting crash recovery due to error 600 Sun Aug 25 19:20:56 CST 2013 Errors in file /opt/oracle/admin/orcl/udump/orcl_ora_16751.trc: ORA-00600: 内部错误代码, 参数: [kcbtema_10], [1], [], [], [], [], [], [] ORA-600 signalled during: ALTER DATABASE OPEN...
使用隐含参数
ALTER SYSTEM SET _allow_resetlogs_corruption=TRUE SCOPE=SPFILE;
报ORA-00704/ORA-01555
因为在前面的恢复中进行了不完全恢复,因此这里加入隐含参数,然后尝试resetlogs,然后报如下错误
Sun Aug 25 20:11:54 CST 2013 alter database open resetlogs Sun Aug 25 20:12:10 CST 2013 RESETLOGS is being done without consistancy checks. This may result in a corrupted database. The database should be recreated. RESETLOGS after incomplete recovery UNTIL CHANGE 13429649847189 Resetting resetlogs activation ID 1312390734 (0x4e397e4e) Sun Aug 25 20:16:25 CST 2013 Setting recovery target incarnation to 2 Sun Aug 25 20:16:42 CST 2013 ************************************************************ Warning: The SCN headroom for this database is only 54 days! ************************************************************ Sun Aug 25 20:16:43 CST 2013 Assigning activation ID 1352200163 (0x5098efe3) Thread 1 opened at log sequence 1 Current log# 1 seq# 1 mem# 0: +DATA/orcl/onlinelog/redo_1_1.log Current log# 1 seq# 1 mem# 1: +DATA/orcl/onlinelog/redo_1_2.log Successful open of redo thread 1 Sun Aug 25 20:16:43 CST 2013 MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set Sun Aug 25 20:16:52 CST 2013 SMON: enabling cache recovery Sun Aug 25 20:16:52 CST 2013 ORA-01555 caused by SQL statement below (SQL ID: 4krwuz0ctqxdt, SCN: 0x0c36.d582339b): Sun Aug 25 20:16:52 CST 2013 select ctime, mtime, stime from obj$ where obj# = :1 Sun Aug 25 20:16:52 CST 2013 Errors in file /opt/oracle/admin/orcl/udump/orcl_ora_2859.trc: ORA-00704: 引导程序进程失败 ORA-00704: 引导程序进程失败 ORA-00604: 递归 SQL 级别 1 出现错误 ORA-01555: 快照过旧: 回退段号 143 (名称为 "_SYSSMU143$") 过小 Error 704 happened during db open, shutting down database USER: terminating instance due to error 704 Termination issued to instance processes. Waiting for the processes to exit Sun Aug 25 20:17:02 CST 2013 Instance termination failed to kill one or more processes Instance terminated by USER, pid = 2859 ORA-1092 signalled during: alter database open resetlogs...
数据库当前SCN
SQL > select CHECKPOINT_CHANGE# from v$database; CHECKPOINT_CHANGE# ------------------ 13429649947222 SQL > select distinct CHECKPOINT_CHANGE# from v$datafile_header; CHECKPOINT_CHANGE# ------------------ 13429649947222
解决方法
因为该数据库版本为10.2.0.5.7,已经包含了scn patch,因此不能使用event或者隐含参数来修改scn,而且该库容量15T以上(asm),因此也无法使用bbed修改数据文件头,最后决定使用ordebug来解决该问题
使用oradebug DUMPvar SGA kcsgscn_
使用oradebug poke
sqlplus / as sysdba startup mount oradebug setmypid oradebug DUMPvar SGA kcsgscn_ oradebug poke recover database; alter database open;
事后总结
查询MOS,发现ORA-00600[kcbtema_10] Raised During Recovery Operations (Doc ID 472282.1)
--故障原因 The cause of this problem has been identified and verified in unpublished Bug 5184359 ORA-600 [KCBTEMA_10]. Due to this bug, during recovery, the class designation of a data block has changed. --处理方法 SQL>startup mount SQL>recover database; SQL>alter database open;
因为MOS上给的解决思路在该数据库中已经无法尝试,不能确定该方法一定可行,但是对于本次的恢复过程中,没有任何直接recover database操作(只有一次不完全恢复)确实让人有无限的遗憾和可惜。对于本次应该先查询MOS,尝试该种方法,慎重使用_allow_resetlogs_corruption参数
乱用_allow_resetlogs_corruption参数导致悲剧
一个朋友11.2.0.1的数据库因为断电,出现不能正常open问题,自己尝试恢复,折腾了几天,最后让我帮忙的时候错误如下
SQL> startup ORACLE 例程已经启动。 Total System Global Area 778387456 bytes Fixed Size 1374808 bytes Variable Size 545260968 bytes Database Buffers 226492416 bytes Redo Buffers 5259264 bytes 数据库装载完毕。 ORA-01092: ORACLE instance terminated. Disconnection forced ORA-00604: error occurred at recursive SQL level 1 ORA-01578: ORACLE data block corrupted (file # 1, block # 225) ORA-01110: data file 1: 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' 进程 ID: 5964 会话 ID: 1144 序列号: 5
从启动的日志提示看初步判断就是悲剧了,因为根据经验值在11gr2版本中,该错误就是undo$(分析trace文件进步一确定是undo$),该block出现异常,数据库在启动的时候要扫描该表,把相关的回滚段给online起来,现在他异常了,数据库肯定无法正常启动
dbv检查数据库文件
F:\>dbv file='F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' DBVERIFY: Release 11.2.0.1.0 - Production on 星期三 5月 22 11:06:00 2013 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. DBVERIFY - 开始验证: FILE = F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF 页 225 流入 - 很可能是介质损坏 Corrupt block relative dba: 0x004000e1 (file 1, block 225) Fractured block found during dbv: Data in bad block: type: 6 format: 2 rdba: 0x004000e1 last change scn: 0x0000.00d65120 seq: 0x1 flg: 0x06 spare1: 0x0 spare2: 0x0 spare3: 0x0 consistency value in tail: 0xb98e0601 check value in block header: 0xb307 computed block checksum: 0xe8ae DBVERIFY - 验证完成 检查的页总数: 134400 处理的页总数 (数据): 98226 失败的页总数 (数据): 0 处理的页总数 (索引): 14189 失败的页总数 (索引): 0 处理的页总数 (其他): 4178 处理的总页数 (段) : 1 失败的总页数 (段) : 0 空的页总数: 17806 标记为损坏的总页数: 1 流入的页总数: 1 加密的总页数 : 0 最高块 SCN : 14045769 (0.14045769)
看到这里,可以确定坏块的存在,根据上面的提示,我们发现tailchk值不正确,应该是5120+06+01,而不该是b98e0601,通过bbed查看
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 0x004000e1 ub4 bas_kcbh @8 0x00d65120 ub2 wrp_kcbh @12 0x0000 ub1 seq_kcbh @14 0x01 ub1 flg_kcbh @15 0x06 (KCBHFDLC, KCBHFCKV) ub2 chkval_kcbh @16 0x5ba9 ub2 spare3_kcbh @18 0x0000 BBED> p tailchk ub4 tailchk @8188 0xb98e0601
进一步证明是tailchk异常导致,分析alert日志,数据库异常断电,然后启动的时候发现如下错误
Recovery of Online Redo Log: Thread 1 Group 2 Seq 431 Reading mem 0 Mem# 0: F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\REDO02.LOG RECOVERY OF THREAD 1 STUCK AT BLOCK 451 OF FILE 3 Aborting crash recovery due to error 1172 Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_772.trc: ORA-01172: 线程 1 的恢复停止在块 451 (在文件 3 中) ORA-01151: 如果需要, 请使用介质恢复以恢复块和还原备份 Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_772.trc: ORA-01172: 线程 1 的恢复停止在块 451 (在文件 3 中) ORA-01151: 如果需要, 请使用介质恢复以恢复块和还原备份 ORA-1172 signalled during: alter database open... Tue May 21 14:27:29 2013 ALTER DATABASE RECOVER datafile 3 Media Recovery Start Serial Media Recovery started Recovery of Online Redo Log: Thread 1 Group 2 Seq 431 Reading mem 0 Mem# 0: F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\REDO02.LOG Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_772.trc (incident=112164): ORA-00600: 内部错误代码, 参数: [3020], [3], [451], [12583363], [], [], [], [], [], [], [], [] ORA-10567: Redo is inconsistent with data block (file# 3, block# 451, file offset is 3694592 bytes) ORA-10564: tablespace UNDOTBS1 ORA-01110: 数据文件 3: 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\UNDOTBS01.DBF' ORA-10560: block type 'KTU UNDO BLOCK' Media Recovery failed with error 600 ORA-283 signalled during: ALTER DATABASE RECOVER datafile 3 ...
因为file# 3, block# 451和redo信息不一致,出现ora-600[3020]错误,而file# 3为undo文件,朋友从而设置undo_management=’manual’并设置了_allow_resetlogs_corruption=true,然后进行不完全恢复,从而出现了如下错误提示
Tue May 21 14:41:23 2013 SMON: enabling cache recovery Corrupt block relative dba: 0x004000e1 (file 1, block 225) Fractured block found during buffer read Data in bad block: type: 6 format: 2 rdba: 0x004000e1 last change scn: 0x0000.00d65120 seq: 0x1 flg: 0x06 spare1: 0x0 spare2: 0x0 spare3: 0x0 consistency value in tail: 0xb98e0601 check value in block header: 0xb307 computed block checksum: 0xe8ae Reading datafile 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' for corruption at rdba: 0x004000e1 (file 1, block 225) Reread (file 1, block 225) found same corrupt data Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_4892.trc (incident=120165): ORA-01578: ORACLE 数据块损坏 (文件号 1, 块号 225) ORA-01110: 数据文件 1: 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_4892.trc: ORA-00604: 递归 SQL 级别 1 出现错误 ORA-01578: ORACLE 数据块损坏 (文件号 1, 块号 225) ORA-01110: 数据文件 1: 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' Errors in file f:\app\administrator\diag\rdbms\yfcloud\yfcloud\trace\yfcloud_ora_4892.trc: ORA-00604: 递归 SQL 级别 1 出现错误 ORA-01578: ORACLE 数据块损坏 (文件号 1, 块号 225) ORA-01110: 数据文件 1: 'F:\APP\ADMINISTRATOR\ORADATA\YFCLOUD\SYSTEM01.DBF' Error 604 happened during db open, shutting down database USER (ospid: 4892): terminating the instance due to error 604
从而的原因基本上可以从操作过程中了解到:数据库是因为file# 3 block# 451和redo不一致导致问题,而恢复的操作人员冲动的使用了_allow_resetlogs_corruption参数,从而使得数据库出现了不一致性,也就是导致file# 1 block# 225坏块的根本原因,针对这样的情况,完全没有到使用_allow_resetlogs_corruption隐含参数地步
使用bbed修改tailchk
BBED> p tailchk ub4 tailchk @8188 0xb98e0601 BBED> verify DBVERIFY - Verification starting FILE = system01.dbf BLOCK = 225 Block 225 is corrupt *** Corrupt block relative dba: 0x004000e1 (file 0, block 225) Fractured block found during verification Data in bad block - type: 6 format: 2 rdba: 0x004000e1 last change scn: 0x0000.00d65120 seq: 0x1 flg: 0x06 consistency value in tail: 0xb98e0601 check value in block header: 0x5ba9, computed block checksum: 0x0 spare1: 0x0, spare2: 0x0, spare3: 0x0 *** 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 : 2 BBED> m /x 01062051 File: system01.dbf (0) Block: 226 Offsets: 8188 to 8191 Dba:0x00000000 ------------------------------------------------------------------------ 01062051 <32 bytes per line> BBED> p tailchk ub4 tailchk @8188 0x51200601 BBED> sum apply Check value for File 0, Block 226: current = 0xb307, required = 0xb307 BBED> verify DBVERIFY - Verification starting FILE = system01.dbf BLOCK = 225 DBVERIFY - Verification complete Total Blocks Examined : 1 Total Blocks Processed (Data) : 1 Total Blocks Failing (Data) : 0 Total Blocks Processed (Index): 0 Total Blocks Failing (Index): 0 Total Blocks Empty : 0 Total Blocks Marked Corrupt : 0 Total Blocks Influx : 0
bbed修改block之后,数据库直接正常打开,完成数据库恢复任务,在这里很明显是因为错误的使用了_allow_resetlogs_corruption参数,屏蔽了redo前滚导致了相关的坏块,所以大家在数据库异常恢复的时候,需要知道各个参数的意义,而不要乱使用,很可能导致不可控结果