(一) 使用备份时的控制文件进行恢复,如下图,即使用备份位置的控制文件进行恢复
1) 创建测试表空间ts1及相关测试表(表空间为ts1)
[email protected]>create tablespace ts1 datafile ‘/u01/app/oracle/oradata/ORCL/ts1.dbf‘ size 10m;
Tablespace created.
[email protected]>create table scott.t(x int) tablespace ts1;
Table created.
[email protected]>insert into scott.t select rownum from dual connect by rownum<=10;
10 rows created.
[email protected]>commit;
Commit complete.
[email protected]>
2) 通过RMAN备份ts1表空间和控制文件
RMAN> backup tablespace ts1 include current controlfile;
Starting backup at 17-JAN-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=141 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00006 name=/u01/app/oracle/oradata/ORCL/ts1.dbf
channel ORA_DISK_1: starting piece 1 at 17-JAN-13
channel ORA_DISK_1: finished piece 1 at 17-JAN-13
piece handle=/u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_nnndf_TAG20130117T101646_8hgqrg9h_.bkp tag=TAG20130117T101646 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
including current control file in backupset
channel ORA_DISK_1: starting piece 1 at 17-JAN-13
channel ORA_DISK_1: finished piece 1 at 17-JAN-13
piece handle=/u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_ncnnf_TAG20130117T101646_8hgqrhvd_.bkp tag=TAG20130117T101646 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 17-JAN-13
RMAN>
3) 删除t表部分记录
[email protected]>delete scott.t where x>=6;
5 rows deleted.
[email protected]>commit;
Commit complete.
[email protected]>
4) 切换几次日志,让上面的动作归档(对于测试来说,意义不是特别的大)
[email protected]>alter system switch logfile;
System altered.
[email protected]>/
System altered.
[email protected]>/
System altered.
[email protected]>/
System altered.
[email protected]>
5) 在users表空间上创建t1表
[email protected]>create table scott.t1(x int) tablespace users;
Table created.
[email protected]>insert into scott.t1 select rownum from dual connect by rownum<=2;
2 rows created.
[email protected]>commit;
Commit complete.
[email protected]>
6) 将表ts1修改为只读模式
[email protected]>alter tablespace ts1 read only;
Tablespace altered.
[email protected]>select tablespace_name,status from dba_tablespaces where tablespace_name=‘TS1‘;
TABLESPACE_NAME STATUS
------------------------- ---------
TS1 READ ONLY
[email protected]>select file_id,file_name,status,online_status from dba_data_files where tablespace_name=‘TS1‘;
FILE_ID FILE_NAME STATUS ONLINE_
---------- --------------------------------------------- --------- -------
6 /u01/app/oracle/oradata/ORCL/ts1.dbf AVAILABLE ONLINE
[email protected]>
7) 删除ts1表空间数据文件和所有控制文件
[email protected]>!rm /u01/app/oracle/oradata/ORCL/ts1.dbf
[email protected]>!rm /u01/app/oracle/oradata/ORCL/*.ctl
8) 重启数据库到nomount状态
[email protected]>shutdown abort;
ORACLE instance shut down.
[email protected]>
[email protected]>startup nomount;
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed Size 1218992 bytes
Variable Size 96470608 bytes
Database Buffers 184549376 bytes
Redo Buffers 2973696 bytes
[email protected]>
9) 通过RMAN备份的控制文件完成控制文件的恢复,恢复完成,数据库修改为mount
RMAN> restore controlfile from ‘/u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_ncnnf_TAG20130117T101646_8hgqrhvd_.bkp‘;
Starting restore at 17-JAN-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=157 devtype=DISK
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:05
output filename=/u01/app/oracle/oradata/ORCL/control01.ctl
output filename=/u01/app/oracle/oradata/ORCL/control02.ctl
output filename=/u01/app/oracle/oradata/ORCL/control03.ctl
Finished restore at 17-JAN-13
RMAN> alter database mount;
database mounted
released channel: ORA_DISK_1
RMAN>
10) 恢复ts1表空间
RMAN> restore tablespace ts1;
Starting restore at 17-JAN-13
Starting implicit crosscheck backup at 17-JAN-13
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=157 devtype=DISK
Crosschecked 2 objects
Finished implicit crosscheck backup at 17-JAN-13
Starting implicit crosscheck copy at 17-JAN-13
using channel ORA_DISK_1
Finished implicit crosscheck copy at 17-JAN-13
searching for all files in the recovery area
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: /u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_ncnnf_TAG20130117T101646_8hgqrhvd_.bkp
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00006 to /u01/app/oracle/oradata/ORCL/ts1.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_nnndf_TAG20130117T101646_8hgqrg9h_.bkp
channel ORA_DISK_1: restored backup piece 1
piece handle=/u01/app/oracle/flash_recovery_area/ORCL/backupset/2013_01_17/o1_mf_nnndf_TAG20130117T101646_8hgqrg9h_.bkp tag=TAG20130117T101646
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 17-JAN-13
RMAN>
11) 表空间恢复完毕,尝试open数据库
--当然,我们知道一定是无法open数据库的,因为控制文件恢复的是老版本的
[email protected]>!ls /u01/app/oracle/oradata/ORCL/ts1.dbf
/u01/app/oracle/oradata/ORCL/ts1.dbf
[email protected]>alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
--提示resetlogs方式打开
[email protected]>alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: ‘/u01/app/oracle/oradata/ORCL/system01.dbf‘
--提示需要恢复1号数据文件
[email protected]>recover datafile 1;
ORA-00283: recovery session canceled due to errors
ORA-01610: recovery using the BACKUP CONTROLFILE option must be done
--提示using BACKUP CONTROLFILE方式完成恢复
[email protected]>
12) using backup controlfile恢复数据库
注:如果要恢复到控制文件SCN以后的时间。这时候,就需要用using backup controlfile. 恢复就不会受“当前controlfile所纪录的SCN”的限制。
这时候的限制就来自于你的语句(until time , until scn),或者可用的archive log(until cancel)
[email protected]>recover database using backup controlfile until cancel;
ORA-00279: change 493760 generated at 01/16/2013 17:10:46 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2013_01_16/o1_mf_1_7_%u_.arc
ORA-00280: change 493760 for thread 1 is in sequence #7
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
--此处回车则是利用下一个归档日志文件进行恢复。不过在这里也可以输入CANCEL,表示恢复到此结束,不再使用后面的归档日志文件
……
--在恢复的过程中又出现了如下警告
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: ‘/u01/app/oracle/oradata/ORCL/system01.dbf‘
[email protected]>
13) 尝试再次resetlogs打开数据库
[email protected]>alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: ‘/u01/app/oracle/oradata/ORCL/system01.dbf‘
[email protected]>
14) 采用极端办法
注:此时只能采取极端手段:隐含参数_allow_resetlogs_corruption强制启动数据库,设置此参数之后,在数据库Open过程中,Oracle会跳过某些一致性检查,从而使数据库可能跳过不一致状态,Open打开:
--查看隐藏参数_allow_resetlogs_corruption,默认值为false
[email protected]>SELECT ksppstvl, ksppdesc
2 FROM x$ksppi x, x$ksppcv y
3 WHERE x.indx = y.indx
4 AND ksppinm = ‘_allow_resetlogs_corruption‘;
KSPPSTVL KSPPDESC
---------- --------------------------------------------------
FALSE allow resetlogs even if it will cause corruption
[email protected]>
--将隐藏参数设置为true
[email protected]>alter system set "_allow_resetlogs_corruption"=true scope=spfile;
System altered.
[email protected]>
--由于是静态参数,重启数据库使其生效
[email protected]>shutdown immediate;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
[email protected]>
--数据库启动到mount状态
[email protected]>startup mount;
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed Size 1218992 bytes
Variable Size 83887696 bytes
Database Buffers 197132288 bytes
Redo Buffers 2973696 bytes
Database mounted.
[email protected]>
15) 再次尝试open数据库,提示RESETLOGS方式open
[email protected]>alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
[email protected]>
16) 数据库成功以resetlogs方式open
[email protected]>alter database open resetlogs;
Database altered.
[email protected]>
[email protected]>select count(*) from scott.t;
COUNT(*)
----------
5
[email protected]>select count(*) from scott.t1;
select count(*) from scott.t1
*
ERROR at line 1:
ORA-00942: table or view does not exist
[email protected]>
17) 恢复参数,重启数据库
[email protected]>alter system set "_allow_resetlogs_corruption"=false scope=spfile;
System altered.
[email protected]>startup force;
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed Size 1218992 bytes
Variable Size 88082000 bytes
Database Buffers 192937984 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
[email protected]>
5.1.1. 小结
如果在生产中使用了只读表空间,那么切记,在修改为只读以后,第一件事儿就是备份,这样会省去不必要的麻烦和损失。