标签归档：kcratr_scan_lastbwr

不当数据库恢复操作导致一个月数据丢失

发表于 2026 年 9 月 4 日由惜分飞

今天分享一个本不该发生的故障,结果由于现场人员没有合适的判断导致客户丢失近一个月数据,事故经过大概是这样的
1. 客户数据库由于断电,启动之后报ORA-600 kcratr_scan_lastbwr错误

2026-09-03T11:22:58.998379+08:00
Beginning crash recovery of 2 threads
 parallel recovery started with 31 processes
 Thread 1: Recovery starting at checkpoint rba (logseq 37738 block 7724), scn 0
 Thread 2: Recovery starting at checkpoint rba (logseq 43821 block 37937), scn 0
2026-09-03T11:22:59.158232+08:00
Started redo scan
Hex dump of (file 20, block 2720) in trace file /u01/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_ora_34049.trc

Reading datafile '+DATA/ORCL/DATAFILE/undotbs01.dbf' for corrupt data at rdba: 0x05000aa0 (file 20, block 2720)
Reread Not Encrypted (file 20, block 2720) found same data 
physically corrupt:No, logically corrupt:No, and is not expected version by upper layer. 
Write verification failed for File 20 Block 2720 (rdba 0x5000aa0)
*****************************************************************
An internal routine has requested a dump of selected redo.
This usually happens following a specific internal error, when
analysis of the redo logs will help Oracle Support with the
diagnosis.
It is recommended that you retain all the redo logs generated (by
all the instances) during the past 12 hours, in case additional
redo dumps are required to help with the diagnosis.
*****************************************************************
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_ora_34049.trc  (incident=430645):
ORA-00600: internal error code, arguments: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/orcl/orcl1/incident/incdir_430645/orcl1_ora_34049_i430645.trc
2026-09-03T11:23:00.484486+08:00
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2026-09-03T11:23:00.510512+08:00
Slave encountered ORA-10388 exception during crash recovery

这个是一个比较常见的错误一般是由于redo写丢失导致(数据库open报ORA-600 kcratr_scan_lastbwr故障处理)

2. 现场操作的技术人员看了下这个错误,觉得数据库有备份，直接决定使用备份进行恢复

结果发现读取的是20260719的备份,而且原始的数据文件在asm里面，已经被覆盖。这个时候如果归档或者增量备份完整,还能够最大限度抢救数据,检查备份发现只有8月7日的增量备份,没有任何归档的备份(使用crontab 直接清理3天之前的归档)

基于这样的情况,应用到最后一个增量备份(也就是8月7日),后面的数据由于归档已经被清理(而且没有备份)

出现这个问题的原因是由于备份脚本本身备份归档,导致备份无法按照策略清理历史备份,导致磁盘空间满,从而后续备份无法继续(直接清理归档了)

恢复只能到此为止,查询最终的文件头恢复时间点

3. 基于这种情况只能尝试强制打开数据库,结果报ORA-600 kcbzibmlt_kcrsds_1错误

SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-00603: ORACLE server session terminated by fatal error
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00600: internal error code, arguments: [kcbzibmlt_kcrsds_1], [], [], []
Process ID: 30365
Session ID: 2180 Serial number: 43414

4. 这种错误类似ORA-600 kcbzib_kcrsds_1的处理思路,使用obet的patch_scn功能直接进行处理

OBET> patch_scn 89103 0x60017e98 3182707622

=== Oracle SCN Patch ===
PID:     89103
Address: 0x60017e98
New Value: 0xbdb443a6 (3182707622)
Original SCN: 0x0

Are you sure you want to modify Oracle SCN? (yes/no): y

SCN modified: 0x0 -> 0xbdb443a6
Oracle SCN successfully modified.

然后打开数据库

SQL> alter database open;

Database altered.

导出数据,导入新库完成本次恢复任务,可惜没有办法帮客户找回来丢失的那一个月数据.

案例总结:
1. rman备份脚本尽量不要有直接删除归档的操作,尽可能是先备份然后再删除(确认备份成功之后删除)
2. 备份还原操作之前,需要看备份文件和日志,大概评估下备份的可用性
3. 尽可能不要在损坏的现场环境上直接做rman还原操作(万一备份无法正常还原,比如中途有备份文件异常呢？)
4. 这个故障,如果不做还原操作,直接异常恢复,基本上也就丢失了当前redo中的数据,损失是最小的

发表在 Oracle备份恢复 | 标签为 kcbzibmlt_kcrsds_1, kcratr_scan_lastbwr, obet patch_scn | 留下评论

ORA-00756 ORA-10567故障数据0丢失恢复

发表于 2025 年 6 月 29 日由惜分飞

客户虚拟化故障修复之后,数据库启动报ORA-600 kcratr_scan_lastbwr错误

这个是一个比较常见的错误,一般recover 下就ok了,但是有些时候会出现ORA-600 3020或者类似ORA-00756 ORA-10567的错误,比如这次不幸就遇到了该错误

SQL> recover database;
ORA-00283: recovery session canceled due to errors
ORA-00756: recovery detected a lost write of a data block
ORA-10567: Redo is inconsistent with data block (file# 10, block# 4005760, file
offset is 2750414848 bytes)
ORA-10564: tablespace PACS55
ORA-01110: data file 10: '/u02/oradata/pacsdb/pacs55.4.dbf'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 76649

然后尝试单个文件recover恢复

SQL> recover datafile 10;
ORA-00283: recovery session canceled due to errors
ORA-00756: recovery detected a lost write of a data block
ORA-10567: Redo is inconsistent with data block (file# 10, block# 4005760, file
offset is 2750414848 bytes)
ORA-10564: tablespace PACS55
ORA-01110: data file 10: '/u02/oradata/pacsdb/pacs55.4.dbf'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 76649

SQL> recover datafile 9;
ORA-00283: recovery session canceled due to errors
ORA-00756: recovery detected a lost write of a data block
ORA-10567: Redo is inconsistent with data block (file# 9, block# 4158754, file
offset is 4003741696 bytes)
ORA-10564: tablespace PACS55
ORA-01110: data file 9: '/u02/oradata/pacsdb/pacs55.3.dbf'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 76660

通过dbv检查这两个异常文件

[oracle@oradb ~]$ dbv file=/u02/oradata/pacsdb/pacs55.3.dbf

DBVERIFY: Release 19.0.0.0.0 - Production on Sat Jun 28 23:02:15 2025

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /u02/oradata/pacsdb/pacs55.3.dbf


DBVERIFY - Verification complete

Total Pages Examined         : 4194302
Total Pages Processed (Data) : 2482487
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 1655515
Total Pages Failing   (Index): 0
Total Pages Processed (Lob)  : 25017
Total Pages Failing   (Lob)  : 0
Total Pages Processed (Other): 15919
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 15364
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 311133131196 (72.1895485884)
[oracle@oradb ~]$ dbv file=/u02/oradata/pacsdb/pacs55.4.dbf 

DBVERIFY: Release 19.0.0.0.0 - Production on Sat Jun 28 23:04:59 2025

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /u02/oradata/pacsdb/pacs55.4.dbf


DBVERIFY - Verification complete

Total Pages Examined         : 4194302
Total Pages Processed (Data) : 2466409
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 1683244
Total Pages Failing   (Index): 0
Total Pages Processed (Lob)  : 16977
Total Pages Failing   (Lob)  : 0
Total Pages Processed (Other): 15909
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 11763
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 311133133727 (72.1895488415)

确定数据文件本身没有坏块,只是redo写丢失或者某种bug导致少量block应用redo的时候异常,而且报错是index,直接通过底层处理报错的block,让其这些报错的block直接不应用日志,然后完成recover操作,其他数据块数据不会丢失(最大限度减少损失,而不是直接修改文件头scn,或者强制拉库的方式来处理)

SQL> select file#,fuzzy from v$datafile_header;

     FILE# FUZ
---------- ---
	 1 NO
	 2 NO
	 3 NO
	 4 NO
	 5 NO
	 7 NO
	 8 NO
	 9 YES
	10 YES
	11 NO
	12 NO

     FILE# FUZ
---------- ---
	13 NO
	14 NO
	15 NO
	16 NO
	17 NO
	18 NO
	19 NO

18 rows selected.

SQL> recover  datafile 9 ;
Media recovery complete.
SQL> recover  datafile 10 ;
ORA-00283: recovery session canceled due to errors
ORA-00756: recovery detected a lost write of a data block
ORA-10567: Redo is inconsistent with data block (file# 10, block# 3822912, file
offset is 1252524032 bytes)
ORA-10564: tablespace PACS55
ORA-01110: data file 10: '/u02/oradata/pacsdb/pacs55.4.dbf'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 76649
 
SQL> recover  datafile 10;
Media recovery complete.

正常open数据库成功,并rebuild 异常的对象

SQL> alter database open;

Database altered.

SQL> select owner,object_name,object_type from dba_objects where data_object_id in(76649,76660);

OWNER
--------------------------------------------------------------------------------
OBJECT_NAME
--------------------------------------------------------------------------------
OBJECT_TYPE
-----------------------
PACS55
STUDYINFO_DIAGRPTID
INDEX

PACS55
PACS_STUDYINFO_PK
INDEX

OWNER
--------------------------------------------------------------------------------
OBJECT_NAME
--------------------------------------------------------------------------------
OBJECT_TYPE
-----------------------


SQL> alter index PACS55.STUDYINFO_DIAGRPTID rebuild online parallel 4;

Index altered.

SQL> alter index PACS55.PACS_STUDYINFO_PK rebuild online parallel 4;

Index altered.

SQL> 
SQL> 
SQL> 
SQL> alter index PACS55.STUDYINFO_DIAGRPTID noparallel;
alter index PACS55.PACS_STUDYINFO_PK noparallel;
Index altered.

SQL> 

Index altered.

至此该库完美恢复业务可以直接使用,业务数据0丢失.这次运气比较好,如果是表数据异常,可能会麻烦一点,但是也可以最大限度恢复(肯定比强制拉库,或者修改文件头的方式效果好)

发表在非常规恢复 | 标签为 kcratr_scan_lastbwr, ORA-00756, ORA-00756 ORA-10567, ORA-10567, ORA-600 kcratr_scan_lastbwr | 评论关闭

数据库open报ORA-600 kcratr_scan_lastbwr故障处理

发表于 2024 年 5 月 30 日由惜分飞

由于断电，导致数据库正常open报ORA-600 kcratr_scan_lastbwr错误

Wed Jan 17 18:23:26 2024
ALTER DATABASE   MOUNT
Successful mount of redo thread 1, with mount id 1028618590
Database mounted in Exclusive Mode
Lost write protection disabled
Completed: ALTER DATABASE   MOUNT
Wed Jan 17 18:23:30 2024
ALTER DATABASE OPEN
Beginning crash recovery of 1 threads
 parallel recovery started with 32 processes
Started redo scan
Hex dump of (file 3, block 144) in trace file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_66361.trc
Reading datafile '/database/oracle/app/oracle/oradata/xff/datafile/o1_mf_undotbs1_hct7001s_.dbf' 
  for corruption at rdba: 0x00c00090 (file 3, block 144)
Reread (file 3, block 144) found same corrupt data (logically corrupt)
Write verification failed for File 3 Block 144 (rdba 0xc00090)
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_66361.trc  (incident=672241):
ORA-00600: internal error code, arguments: [kcratr_scan_lastbwr], [], [], [], [], []
Incident details in: /database/oracle/app/oracle/diag/rdbms/xff/xff/incident/incdir_672241/xff_ora_66361_i672241.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Aborting crash recovery due to error 600
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_66361.trc:
ORA-00600: internal error code, arguments: [kcratr_scan_lastbwr], [], [], [], [], []
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_66361.trc:
ORA-00600: internal error code, arguments: [kcratr_scan_lastbwr], [], [], [], [], []
ORA-600 signalled during: ALTER DATABASE OPEN...

尝试recover 数据库报ORA-600 3020错误

Wed Jan 17 18:28:38 2024
ALTER DATABASE RECOVER  database  
Media Recovery Start
 started logmerger process
Parallel Media Recovery started with 96 slaves
Wed Jan 17 18:28:41 2024
Recovery of Online Redo Log: Thread 1 Group 2 Seq 410864 Reading mem 0
  Mem# 0: /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_2_hct740hq_.log
Wed Jan 17 18:28:42 2024
ORA-00600: internal error code, arguments: [3020], [3], [240], [12583152], [], []
ORA-10567: Redo is inconsistent with data block (file# 3, block# 240, file offset is 1966080 bytes)
ORA-10564: tablespace UNDOTBS1
ORA-01110: data file 3: '/database/oracle/app/oracle/oradata/xff/datafile/o1_mf_undotbs1_hct7001s_.dbf'
ORA-10560: block type 'KTU SMU HEADER BLOCK'
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Slave exiting with ORA-600 exception
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_pr19_68212.trc:
ORA-00600: internal error code, arguments: [3020], [3], [240], [12583152], [], []
ORA-10567: Redo is inconsistent with data block (file# 3, block# 240, file offset is 1966080 bytes)
ORA-10564: tablespace UNDOTBS1
ORA-01110: data file 3: '/database/oracle/app/oracle/oradata/xff/datafile/o1_mf_undotbs1_hct7001s_.dbf'
ORA-10560: block type 'KTU SMU HEADER BLOCK'
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_68038.trc  (incident=672243):
ORA-00600: internal error code, arguments: [3020], [3], [240], [12583152], [], []
ORA-10567: Redo is inconsistent with data block (file# 3, block# 240, file offset is 1966080 bytes)
ORA-10564: tablespace UNDOTBS1
ORA-01110: data file 3: '/database/oracle/app/oracle/oradata/xff/datafile/o1_mf_undotbs1_hct7001s_.dbf'
ORA-10560: block type 'KTU SMU HEADER BLOCK'
Wed Jan 17 18:28:43 2024
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Recovery Slave PR19 previously exited with exception 600
Wed Jan 17 18:28:43 2024
Sweep [inc][672865]: completed
Media Recovery failed with error 448
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_pr00_68115.trc:
ORA-00283: recovery session canceled due to errors
ORA-00448: normal completion of background process
ORA-600 signalled during: ALTER DATABASE RECOVER  database  ...

加上隐含参数尝试强制拉库

alter database open resetlogs
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 6165467436
Clearing online redo logfile 1 /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_1_hct740fp_.log
Clearing online log 1 of thread 1 sequence number 0
Clearing online redo logfile 1 complete
Clearing online redo logfile 2 /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_2_hct740hq_.log
Clearing online log 2 of thread 1 sequence number 0
Clearing online redo logfile 2 complete
Clearing online redo logfile 3 /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_3_hct740k7_.log
Clearing online log 3 of thread 1 sequence number 0
Clearing online redo logfile 3 complete
Online log /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_1_hct740fp_.log: Thread 1 Group 1 was previously cleared
Online log /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_2_hct740hq_.log: Thread 1 Group 2 was previously cleared
Online log /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_3_hct740k7_.log: Thread 1 Group 3 was previously cleared
Fri Jan 19 09:24:59 2024
Setting recovery target incarnation to 2
Initializing SCN for created control file
Database SCN compatibility initialized to 3
Warning - High Database SCN: Current SCN value is 6165467439, threshold SCN value is 0
If you have not previously reported this warning on this database,
  please notify Oracle Support so that additional diagnosis can be performed.
Fri Jan 19 09:24:59 2024
Assigning activation ID 1028784413 (0x3d52011d)
Thread 1 opened at log sequence 1
  Current log# 1 seq# 1 mem# 0: /database/oracle/app/oracle/oradata/xff/onlinelog/o1_mf_1_hct740fp_.log
Successful open of redo thread 1
Fri Jan 19 09:24:59 2024
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Fri Jan 19 09:24:59 2024
SMON: enabling cache recovery
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_84860.trc  (incident=1344255):
ORA-00600: internal error code, arguments: [2662], [1], [1870500147], [1], [1870515285], [12583040]
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_84860.trc:
ORA-00600: internal error code, arguments: [2662], [1], [1870500147], [1], [1870515285], [12583040]
Errors in file /database/oracle/app/oracle/diag/rdbms/xff/xff/trace/xff_ora_84860.trc:
ORA-00600: internal error code, arguments: [2662], [1], [1870500147], [1], [1870515285], [12583040]
Error 600 happened during db open, shutting down database
USER (ospid: 84860): terminating the instance due to error 600
Instance terminated by USER, pid = 84860
ORA-1092 signalled during: alter database open resetlogs...

客户自行恢复到这一步,后面无法处理,接手之后进行恢复，其实后面比较简单了，就是修改下数据库scn,数据库就可以open起来,然后处理异常的undo和对象即可,可以参考以前类似文章:
ORA-600 2662快速恢复之Patch scn工具
 硬件故障导致ORA-600 2662错误处理
 ORA-00600 [2662]和ORA-00600 [4194]恢复
更多参考:惜分飞blog中ORA-600 2662文章

发表在 Oracle备份恢复 | 标签为 kcratr_scan_lastbwr, ORA-600 2662, ORA-600 3020, ORA-600 kcratr_scan_lastbwr | 评论关闭

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标签归档：kcratr_scan_lastbwr

不当数据库恢复操作导致一个月数据丢失

ORA-00756 ORA-10567故障数据0丢失恢复

数据库open报ORA-600 kcratr_scan_lastbwr故障处理

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标签归档：kcratr_scan_lastbwr

不当数据库恢复操作导致一个月数据丢失

ORA-00756 ORA-10567故障数据0丢失恢复

数据库open报ORA-600 kcratr_scan_lastbwr故障处理

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