rman备份恢复测试
1，打开数据库新建测试数据
$sqlplus / nolog
SQL>conn / as sysdba
SQL>startup
SQL>create table cds(id number(1),name varchar2(20));
SQL>insert into cds(id,name) values('1','litao');
2，启动到归档模式
$sqlplus / nolog
SQL>conn / as sysdba
SQL>alter database archivelog;
SQL>archive log list;
* #data 记录时间，将该时间点添加到恢复脚本中
3，做数据库全备份
$rman target /
RMAN> configure controlfile autobackup on;
RMAN>configure channel device type disk format ‘/home/oracle/backup/%U’;
RMAN>backup database;
4，修改数据库
SQL>drop table cds;
5，启动数据库到mount状态
$sqlplus / nolog
SQL>conn / as sysdba
SQL>startup mount
6，恢复数据库
$rman target /
RMAN>configure channel device type disk format '/home/oracle/backup/%U';
RMAN> restore database;
RMAN>recover database until time "to_date('2011-02-17 12:30:00','yyyy-mm-dd hh24:mi:ss')";
恢复到某一个时间点，时间点为删除数据库之前的系统时间
# RMAN>release channel t1；
(实际上rman也是一个数据库的连接，我们一般做测试的时候都是起一个通道；如果是在生产环境下，我们可能同时开多个通道进行数据库的备份,恢复完成需要释放通道）
7，查看恢复后的数据库
$sqlplus / nolog
SQL>conn / as sysdba
SQL>startup mount;
SQL>alter database open resetlogs;
SQL>select * from cds;
RMAN> shutdown immediate;
database dismounted
Oracle instance shut down
RMAN> startup nomount
connected to target database (not started)
Oracle instance started
Total System Global Area 167772160 bytes
Fixed Size 1260672 bytes
Variable Size 150995840 bytes
Database Buffers 8388608 bytes
Redo Buffers 7127040 bytes
RMAN> alter database mount
2> ;
database mounted
released channel: ORA_DISK_1
RMAN> reset database to incarnation 2 ;
RMAN> list incarnation;
List of Database Incarnations
DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1 1 ORCL 1168992346 PARENT 1 2006-11-16 18:40:24
2 2 ORCL 1168992346 CURRENT 456954 2007-12-13 10:20:12
3 3 ORCL 1168992346 ORPHAN 3326890 2008-06-23 11:07:57
RMAN> RESTORE DATABASE UNTIL SCN 3326890
2> ;
Starting restore at 2008-06-23 12:27:19
using channel ORA_DISK_1
skipping datafile 1; already restored to file /u/app/oracle/oradata/orcl/systemf
skipping datafile 2; already restored to file /u/app/oracle/oradata/orcl/undotbf
skipping datafile 3; already restored to file /u/app/oracle/oradata/orcl/sysauxf
skipping datafile 4; already restored to file /u/app/oracle/oradata/orcl/users0f
restore not done; all files readonly, offline, or already restored
Finished restore at 2008-06-23 12:27:19
RMAN> alter database open resetlogs;
database opened
RMAN> list incarnation;
List of Database Incarnations
DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1 1 ORCL 1168992346 PARENT 1 2006-11-16 18:40:24
2 2 ORCL 1168992346 PARENT 456954 2007-12-13 10:20:12
4 4 ORCL 1168992346 CURRENT 3326784 2008-06-23 12:27:43
3 3 ORCL 1168992346 ORPHAN 3326890 2008-06-23 11:07:57
至此数据库恢复到较早前一个时间点。
