以下的文章主要介绍的是由于一次误操作而引起的Oracle数据库的大恢复,前两天我在Oracle 10g手动建库脚本中柔然看到dbms_backup_restore.zerodbid(0)的过程,其中主要的作用是修改Oracle数据库的dbid。
于是想通过该存储直接在sqlplus中执行修改dbid。
修改之前记录其dbid
引用
- SQL> select dbid from v$database;
- DBID
- 1488207495
修改dbid
引用
- SQL> exec dbms_backup_restore.zerodbid(0);
- PL/SQL procedure successfully completed.
貌似执行成功了,但随后alert日志显示ckpt进程将数据实例终止
引用
- Tue Mar 9 01:43:22 2010
- CKPT: terminating instance due to error 1242
- Instance terminated by CKPT, pid = 16653
- Tue Mar 9 01:43:53 2010
再次启动Oracle数据库报错
引用
- Tue Mar 9 01:56:09 2010
- Errors in file /ora10g/app/admin/ldbra/udump/ldbra_ora_12275.trc:
- ORA-01221: data file 1 is not the same file to a background process
- ORA-1221 signalled during: ALTER DATABASE OPEN...
dump Oracle数据文件头
引用
- SQL> ALTER SESSION SET EVENTS 'immediate trace name file_hdrs level 3';
通过跟踪文件可以看到dbid以被重置为0
引用
- V10 STYLE FILE HEADER:
- Compatibility Vsn = 169870080=0xa200300
- Db ID=0=0x0, Db Name='LDBRA'
- Activation ID=0=0x0
- Control Seq=8122=0x1fba, File size=65280=0xff00
- File Number=1, Blksiz=8192, File Type=3 DATA
还有一种途径是通过bbed工具观察
引用
- struct kcvfhhdr, 76 bytes @20
- ub4 kccfhswv @20 0x00000000
- ub4 kccfhcvn @24 0x0a200300
- ub4 kccfhdbi @28 0x00000000
当然第一反应是重建控制文件,看看能不能恢复成功
引用
- SQL> alter database backup controlfile to trace;
- Database altered.
- STARTUP NOMOUNT
- CREATE CONTROLFILE REUSE DATABASE "LDBRA" RESETLOGS ARCHIVELOG
- MAXLOGFILES 16
- MAXLOGMEMBERS 3
- MAXDATAFILES 100
- MAXINSTANCES 8
- MAXLOGHISTORY 292
- LOGFILE
- GROUP 1 '/ora10g/app/oradata/ldbra/redo01.log' SIZE 50M,
- GROUP 2 '/ora10g/app/oradata/ldbra/redo02.log' SIZE 50M,
- GROUP 3 '/ora10g/app/oradata/ldbra/redo03.log' SIZE 50M
- -- STANDBY LOGFILE
- DATAFILE
- '/ora10g/app/oradata/ldbra/system01.dbf',
- '/ora10g/app/oradata/ldbra/undotbs01.dbf',
- '/ora10g/app/oradata/ldbra/sysaux01.dbf',
- '/ora10g/app/oradata/ldbra/users01.dbf',
- '/ora10g/app/oradata/ldbra/example01.dbf',
- '/ora10g/app/product/10.2.0/db_1/dbs/company.dbf',
- '/ora10g/app/product/10.2.0/db_1/dbs/streams.dbf'
- CHARACTER SET ZHS16GBK