ORA-600 kcratr_scan_lastbwr 恢复

有朋友找到我们,系统断电之后,数据库无法正常启动,报ora-600 kcratr_scan_lastbwr错误

Thu Mar 25 20:33:45 2021
Database mounted in Exclusive Mode
Lost write protection disabled
Completed: alter database mount exclusive
alter database open
Ping without log force is disabled
.
Thu Mar 25 20:33:47 2021
Beginning crash recovery of 1 threads
 parallel recovery started with 32 processes
Thu Mar 25 20:33:47 2021
Started redo scan
Hex dump of (file 10, block 176517) in trace file C:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4176.trc

Reading datafile 'C:\APP\ADMINISTRATOR\ORADATA\ORCL\XFF.DBF' for corruption at rdba: 0x0282b185 (file 10, block 176517)
Reread (file 10, block 176517) found same corrupt data (logically corrupt)
Write verification failed for File 10 Block 176517 (rdba 0x282b185)
Errors in file C:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4176.trc  (incident=165355):
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
Incident details in: C:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\incident\incdir_165355\orcl_ora_4176_i165355.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Thu Mar 25 20:33:50 2021
Slave encountered ORA-10388 exception during crash recovery
Thu Mar 25 20:33:50 2021
Slave encountered ORA-10388 exception during crash recovery
Thu Mar 25 20:33:50 2021
Aborting crash recovery due to error 600
Thu Mar 25 20:33:59 2021
Errors in file C:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4176.trc:
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
Thu Mar 25 20:33:59 2021
Errors in file C:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4176.trc:
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
ORA-600 signalled during: alter database open...

故障原因,写丢失导致

Crash or instance recovery may fail because of a lost write even
though one of the mirrors has a good copy.  Reading a file header 
can corrupt a good mirror copy with a bad one.
 
Rediscovery Notes:
 ORA-600 [kcratr_scan_lostwrt] or ORA-600 [kcratr_scan_lastbwr] are signaled 
 even though one of the mirrors has a good copy.

解决方案比较简单直接recover顺利open库