记录8.0.5数据库恢复过程

某银行须要恢复2004年磁带备份数据库 8.0.5,当时由于开发商使用begin backup命令进行热备,而后压缩到磁带上.在硬盘紧张,rman不成熟的时代,使用这样的方法备份自己没有大问题,但是由于没有备份归档日志,给如今的恢复带来了不少的问题.
尝试不彻底恢复启动库

SVRMGR> startup pfile='init.ora' mount ORACLE instance started. Total System Global Area                        141826208 bytes Fixed Size                                          47264 bytes Variable Size                                   124829696 bytes Database Buffers                                 16777216 bytes Redo Buffers                                       172032 bytes Database mounted. SVRMGR> recover database using backup controlfile until cancel; ORA-00279: change 613561556 generated at 08/21/04 22:42:48 needed for thread 1 ORA-00289: suggestion : /oracle/product/8.0.5/dbs/arch1_55329.dbf ORA-00280: change 613561556 for thread 1 is in sequence #55329 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} cancel Media recovery cancelled. SVRMGR> alter database open resetlogs; alter database open resetlogs * ORA-00600: internal error code, arguments: [4146], [31400], [31370], [], [], [], [], []

这个错误是由于回滚段corruption致使,客户已经没有了一致性要求,因此解决办法是经过一些手段找出回滚段并屏蔽

屏蔽回滚段重启库

SVRMGR> shutdown abort ORACLE instance shut down. SVRMGR> startup  pfile='init.ora' mount ORACLE instance started. Total System Global Area                        141826208 bytes Fixed Size                                          47264 bytes Variable Size                                   124829696 bytes Database Buffers                                 16777216 bytes Redo Buffers                                       172032 bytes Database mounted. SVRMGR> alter database open; alter database open * ORA-00600: internal error code, arguments: [3668], [1], [2], [55992], [55992], [4], [], []

根据ORA-00600[3668]错误的提示,由于重建控制文件,有一个数据文件由于在磁带恢复丢失,因此控制文件在上次重建的时候没有包含进去,根据经验在8.0中能够经过resetlogs解决

resetlogs从新打开数据库

SVRMGR> alter database open resetlogs; alter database open resetlogs * ORA-01139: RESETLOGS option only valid after an incomplete database recovery SVRMGR> recover datatabase using backup controlfile until cancel; ORA-00274: illegal recovery option DATATABASE SVRMGR> recover database using backup controlfile until cancel; ORA-00279: change 613561558 generated at 07/30/12 09:14:49 needed for thread 1 ORA-00289: suggestion : /oracle/product/8.0.5/dbs/arch1_1.dbf ORA-00280: change 613561558 for thread 1 is in sequence #1 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} cancel Media recovery cancelled. SVRMGR> alter database open resetlogs; alter database open resetlogs * ORA-00604: error occurred at recursive SQL level 1 ORA-01555: snapshot too old: rollback segment number  with name "" too small

根据经验多是屏蔽了undo或者undo损坏,而后有事务可能须要读undo,没法读到对应记录,可能出现此错误,由于无trace文件,尝试推动scn解决.固然这个问题能够经过open时作10046而后深刻分析也许能够找到缘由.

open数据库成功
根据上面的分析,重启库,推动scn,resetlogs库解决问题

SVRMGR> shutdown immediate ORA-01109: database not open Database dismounted. ORACLE instance shut down. SVRMGR> startup pfile='init.ora' mount; ORACLE instance started. Total System Global Area                        141826208 bytes Fixed Size                                          47264 bytes Variable Size                                   124829696 bytes Database Buffers                                 16777216 bytes Redo Buffers                                       172032 bytes Database mounted. SVRMGR> alter database open ; alter database open * ORA-00600: internal error code, arguments: [3668], [1], [2], [55994], [55994], [4], [], [] SVRMGR> recover database using backup controlfile until cancel; ORA-00279: change 613561560 generated at 07/30/12 09:17:11 needed for thread 1 ORA-00289: suggestion : /oracle/product/8.0.5/dbs/arch1_1.dbf ORA-00280: change 613561560 for thread 1 is in sequence #1 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} cancel Media recovery cancelled. SVRMGR> alter database open resetlogs; Statement processed.

此次恢复比较幸运,在备份到磁带过程当中被覆盖的一个同名的数据文件,由于是index,经过查询dba_extents,而后删除并重建相关index,s数据库算恢复彻底.有些时候,对数据库多一份备份,可能成为最后的救命稻草,哪怕是一份不是十分完整的备份.再次重复:对dba而言,数据库备份重于一切

 

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