shutdown abort模式丢失redo,使用隐含參数启库
shutdown abort模式
丢失redo log
无法open数据库
通过告警报错ORA-00354: corrupt redo log block header 从该错误能够看出当前日志的redo block的header出现故障,导致oracle无法读取redo进行恢复。通过下面检查发现数据库文件头都一致。没有须要恢复的文件,可是因为数据库是非正常关闭。last_change scn没有被写入,数据库推断须要恢复。则读取对应的redo log group 3。可是此时该文件已经损坏。
丢失redo log
无法open数据库
通过告警报错ORA-00354: corrupt redo log block header 从该错误能够看出当前日志的redo block的header出现故障,导致oracle无法读取redo进行恢复。通过下面检查发现数据库文件头都一致。没有须要恢复的文件,可是因为数据库是非正常关闭。last_change scn没有被写入,数据库推断须要恢复。则读取对应的redo log group 3。可是此时该文件已经损坏。
SYS@orcl11g>alter database open resetlogs; alter database open resetlogs * ERROR at line 1: ORA-01139: RESETLOGS option only valid after an incomplete database recovery SYS@orcl11g>recover database; ORA-00283: recovery session canceled due to errors ORA-00313: open failed for members of log group 3 of thread 1 ORA-00312: online log 3 thread 1: '/opt/oracle/oradata/orcl11g/redo03.log' ORA-27046: file size is not a multiple of logical block size Additional information: 1 SYS@orcl11g>recover database until cancel; ORA-00279: change 5168496 generated at 10/29/2014 23:48:23 needed for thread 1 ORA-00289: suggestion : /opt/oracle/flash_recovery_area/ORCL11G/archivelog/2014_10_29/o1_mf_1_159_%u_.arc ORA-00280: change 5168496 for thread 1 is in sequence #159 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} ORA-00308: cannot open archived log '/opt/oracle/flash_recovery_area/ORCL11G/archivelog/2014_10_29/o1_mf_1_159_%u_.arc' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 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: '/opt/oracle/oradata/orcl11g/system01.dbf'
增加下面隐含參数: SYS@orcl11g>show parameter _allow NAME TYPE VALUE ------------------------------------ ---------------------- ------------------------------ _allow_error_simulation boolean TRUE _allow_resetlogs_corruption boolean TRUE
这时候发现数据库时能够打开的
SYS@orcl11g> SYS@orcl11g> SYS@orcl11g>alter database open resetlogs; Database altered. SYS@orcl11g> 发现日志文件已经被重建: SYS@orcl11g>select group#,status from v$log; GROUP# STATUS ---------- ------------------------------------------------------------ 1 CURRENT 2 UNUSED 3 UNUSED SYS@orcl11g>alter system switch logfile; System altered. SYS@orcl11g>/ System altered. SYS@orcl11g>/ System altered. SYS@orcl11g>select group#,status from v$log; GROUP# STATUS ---------- ------------------------------------------------------------ 1 CURRENT 2 INACTIVE 3 ACTIVE