Oracle恢复实验（四）：所有控制文件和数据文件丢失。

环境：Oracle10g、Red Hat 4，Oracle运行在归档模式。

场景：所有控制文件和数据文件丢失。

具体步骤：

1、主机断电，导致数据文件和所有控制文件全部丢失

SQL> !rm -f /home/oracle/oracle/product/oradata/orcl/*.ctl

SQL> !rm -f /home/oracle/oracle/product/oradata/orcl/*.dbf

SQL> !ls /home/oracle/oracle/product/oradata/orcl

redo01.log redo02.log redo03.log

SQL> shutdown abort

ORACLE instance shut down.

2、尝试打开数据库

SQL> startup

ORACLE instance started.

Total System Global Area 130023424 bytes

Fixed Size 1218100 bytes

Variable Size 62917068 bytes

Database Buffers 62914560 bytes

Redo Buffers 2973696 bytes

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

提示找不到控制文件

3、拷贝数据文件和控制文件

SQL> !cp /disk2/oracle/coldbak/*.ctl /home/oracle/oracle/product/oradata/orcl/

SQL> !cp /disk2/oracle/coldbak/*.dbf /home/oracle/oracle/product/oradata/orcl/

4、尝试打开数据库

SQL> startup

ORACLE instance started.

Total System Global Area 130023424 bytes

Fixed Size 1218100 bytes

Variable Size 62917068 bytes

Database Buffers 62914560 bytes

Redo Buffers 2973696 bytes

Database mounted.

ORA-00338: log 2 of thread 1 is more recent than control file

ORA-00312: online log 2 thread 1:

'/home/oracle/oracle/product/oradata/orcl/redo02.log'

提示控制文件比较旧，记录的日志序号比redo日志的小。

5、获取重建控制文件的脚本

SQL> alter database backup controlfile to trace;

Database altered.

从udump目录中找到脚本。

CREATE CONTROLFILE REUSE DATABASE "ORCL" NORESETLOGS ARCHIVELOG

MAXLOGFILES 16

MAXLOGMEMBERS 3

MAXDATAFILES 100

MAXINSTANCES 8

MAXLOGHISTORY 292

LOGFILE

GROUP 1 '/home/oracle/oracle/product/oradata/orcl/redo01.log' SIZE 50M,

GROUP 2 '/home/oracle/oracle/product/oradata/orcl/redo02.log' SIZE 50M,

GROUP 3 '/home/oracle/oracle/product/oradata/orcl/redo03.log' SIZE 50M

-- STANDBY LOGFILE

DATAFILE

'/home/oracle/oracle/product/oradata/orcl/system01.dbf',

'/home/oracle/oracle/product/oradata/orcl/undotbs01.dbf',

'/home/oracle/oracle/product/oradata/orcl/sysaux01.dbf',

'/home/oracle/oracle/product/oradata/orcl/users01.dbf'

CHARACTER SET AL32UTF8

;

6、重启数据库到nomount状态、执行重建控制文件脚本

SQL> shutdown immediate

Database dismounted.

ORACLE instance shut down.

SQL> startup nomount

ORACLE instance started.

Total System Global Area 130023424 bytes

Fixed Size 1218100 bytes

Variable Size 62917068 bytes

Database Buffers 62914560 bytes

Redo Buffers 2973696 bytes

7、尝试打开数据库

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01113: file 1 needs media recovery

ORA-01110: data file 1: '/home/oracle/oracle/product/oradata/orcl/system01.dbf'

8、介质恢复

SQL> recover database;

Media recovery complete.

9、打开数据库

SQL> alter database open;

Database altered.

SQL> conn scott/oracle

Connected.

SQL> select * from tab;

TNAME TABTYPE CLUSTERID

------------------------------ ------- ----------

DEPT TABLE

EMP TABLE

BONUS TABLE

SALGRADE TABLE

RECOVER_TEST TABLE

RECOVER_TEST2 TABLE

6 rows selected.

SQL> select count(*) from recover_test2;

COUNT(*)

----------

28672