之前做好备份

SQL> conn scott/abc123

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';  2012-04-24 10:10:53

SQL> select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;

SYSDATE

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

2012-03-12 01:28:15

SQL> drop table emp;

SQL> commit;

SQL> shutdown abort;

SQL> startup mount

SQL> !rman target /

RMAN> run {

set until time "to_date('2012-04-24 10:10:53','yyyy-mm-dd hh24:mi:ss')";

restore database;

recover database;

alter database open resetlogs;

}

数据库直接打开

scott用户查看emp表

==============================================

所有文件丢失,参数文件也丢失

RMAN> backup database;

1.删除所有文件

[oracle@sq123 ~]$ cd /oracle/app/oradata/TEST/

[oracle@sq123 TEST]$ rm -rf *

cd /oracle/app/oracle/product/10.2.0/db_1/dbs

[oracle@sq123 dbs]$ rm -rf spfileTEST.ora

[oracle@sq123 dbs]$ rm -rf initdw.ora

SQL> startup

(失败,找不到参数文件)

2.[oracle@sq123 ~]$ cd /oracle/app/admin/TEST/bdump/

[oracle@sq123 bdump]$ tail -500 alert_TEST.log |more

(找到之前启动时的参数)

processes                = 150

__shared_pool_size       = 79691776

__large_pool_size        = 4194304

__java_pool_size         = 4194304

__streams_pool_size      = 0

nls_language             = AMERICAN

sga_target               = 285212672

control_files            = /oracle/app/oradata/TEST/control01.ctl, /oracle/app/orad

ata/TEST/control02.ctl, /oracle/app/oradata/TEST/control03.ctl

db_block_size            = 8192

__db_cache_size          = 192937984

compatible               = 10.2.0.1.0

db_file_multiblock_read_count= 16

db_recovery_file_dest    = /oracle/app/flash_recovery_area

db_recovery_file_dest_size= 2147483648

undo_management          = AUTO

undo_tablespace          = UNDOTBS1

remote_login_passwordfile= EXCLUSIVE

db_domain                =

dispatchers              = (PROTOCOL=TCP) (SERVICE=TESTXDB)

job_queue_processes      = 10

background_dump_dest     = /oracle/app/admin/TEST/bdump

user_dump_dest           = /oracle/app/admin/TEST/udump

core_dump_dest           = /oracle/app/admin/TEST/cdump

audit_file_dest          = /oracle/app/admin/TEST/adump

db_name                  = TEST

open_cursors             = 300

pga_aggregate_target     = 94371840

3.[oracle@sq123 ~]$ vi initnew.ora

把上面的复制过来

不要复制的行

db_domain                =

dispatchers              = (PROTOCOL=TCP) (SERVICE=TESTXDB)

4.SQL> startup nomount pfile=/home/oracle/initnew.ora

(启动正常)

5.恢复spfile

RMAN> restore spfile from '/oracle/app/flash_recovery_area/TEST/backupset/2012_03_12/o1_mf_ncsnf_TAG20120312T003337_7oso413h_.bkp';

[oracle@sq123 ~]$ cd /oracle/app/oracle/product/10.2.0/db_1/dbs

[oracle@sq123 dbs]$ ls(spfile 已经恢复)

6.SQL> startup nomount force;(用恢复的spfile启动)

恢复控制文件

RMAN> restore controlfile from '/oracle/app/flash_recovery_area/TEST/backupset/2012_03_12/o1_mf_ncsnf_TAG20120312T003337_7oso413h_.bkp';

7.恢复数据文件

RMAN> alter database mount;

RMAN> restore database;

RMAN> recover database;(报错因为没有日志了，但必须运行)

RMAN> alter database open resetlogs;

（数据库正常）

==============================================

测试备份是否有用

RMAN> restore database validate;

（测试不真正恢复）

[oracle@sq123 2012_03_12]$ echo "a" >>o1_mf_nnndf_TAG20120312T003337_7osnz2q6_.bkp

（模拟备份实效）

RMAN> restore database validate;（报错）

查看那些文件需要备份

RMAN> report need backup;

==========================================

免除表空间

RMAN>configure exclude for tablespace user03;

RMAN>backup database;

=======================================

块恢复

RMAN> blockrecover datafile 12 block 2718618 from backupset;