Oracle控制文件备份恢复 noresetlogs 恢复

控制文件的备份有两种格式的备份，一种是文本格式的备份另一种是二进制格式的备份

备份文本格式

SQL> alterdatabase backup controlfile to trace as '/bk/con.sql';

Databasealtered.

备份二进制格式

SQL> alterdatabase backup controlfile to trace as '/bk/con.ctl';

Databasealtered.

----加上as字句是为了自定义存储的位置

noresetlog重建控制文件SQL>!cp /etc/passwd /u01/tiger/oradata/orcl2/control01.ctl

SQL> altersystem swirch logfile;

alter systemswirch logfile

             *

ERROR at line 1:

ORA-02065:illegal option for ALTER SYSTEM

SQL> altersystem switch logfile;

alter systemswitch logfile

             *

ERROR at line 1:

ORA-03113:end-of-file on communication channel

SQL> conn /assysdba

Connected to anidle instance.

SQL> startup

Oracle instancestarted.

Total SystemGlobal Area  314572800 bytes

Fixed Size                  1219136 bytes

VariableSize             109053376 bytes

DatabaseBuffers          197132288 bytes

RedoBuffers                7168000 bytes

ORA-00205: errorin identifying control file, check alert log for more info

这里发现当mount的时候发现控制文件有问题，这样我们可以根据之前备份的控制文件的文本文件来恢复控制文件

CREATECONTROLFILE REUSE DATABASE "ORCL2" NORESETLOGS  ARCHIVELOG

    MAXLOGFILES 16

   MAXLOGMEMBERS 3

    MAXDATAFILES 100

    MAXINSTANCES 8

    MAXLOGHISTORY 292

LOGFILE

  GROUP 1'/u01/tiger/oradata/orcl2/redo01.log' SIZE 50M,

  GROUP 2'/u01/tiger/oradata/orcl2/redo02.log' SIZE 50M,

  GROUP 3'/u01/tiger/oradata/orcl2/redo03.log'  SIZE50M

DATAFILE

  '/u01/tiger/oradata/orcl2/system01.dbf',

  '/u01/tiger/oradata/orcl2/tiger.dbf',

  '/u01/tiger/oradata/orcl2/sysaux01.dbf',

  '/u01/tiger/oradata/orcl2/users01.dbf',

  '/u01/tiger/oradata/orcl2/undotbs02.dbf',

  '/u01/tiger/oradata/orcl2/undotbs01',

  '/u01/tiger/oradata/orcl2/tiger01.dbf'

CHARACTER SETZHS16GBK

SQL> alterdatabase open;

alter databaseopen

*

ERROR at line 1:

ORA-01113: file1 needs media recovery

ORA-01110: datafile 1: '/u01/tiger/oradata/orcl2/system01.dbf'

SQL> recoverdatabase;

Media recoverycomplete.

SQL> alterdatabase open;

Databasealtered.