OCP-1Z0-053-V12.02-323题

 323.What is the correct order of the following commands if you wanted to restore datafile 4, which was

accidentally removed from the file system?

A. sql 'alter database datafile 4 online';

B. restore datafile 4;

C. recover datafile 4;

D. sql 'alter database datafile 4 offline';

E. startup

F. shutdown

G. a, c, b, d

H. d, b, c, a

I. f, d, b, c, a, e

J. c, a, b, d, f

K. a, b, d, e

Answer: B

答案解析：

此题的选项有点问题，故从另一套找来正确的题。

按题意：数据文件4不小心被删除，现在需要恢复，以下是恢复步骤：

1、实验之前需要先备份：

RMAN> backup datafile 4;

 

Starting backup at 23-SEP-13

using channel ORA_DISK_1

channel ORA_DISK_1: starting full datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

input datafile file number=00004 name=/u01/app/oracle/oradata/test0910/users01.dbf

channel ORA_DISK_1: starting piece 1 at 23-SEP-13

channel ORA_DISK_1: finished piece 1 at 23-SEP-13

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_23/o1_mf_nnndf_TAG20130923T100457_940ln9o6_.bkp tag=TAG20130923T100457 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 23-SEP-13

 

2、模拟不小心删除

[oracle@rtest test0910]$ rm /u01/app/oracle/oradata/test0910/users01.dbf

 

3、开始恢复

RMAN> sql 'alter database datafile 4 offline';

 

using target database control file instead of recovery catalog

sql statement: alter database datafile 4 offline

 

RMAN> restore datafile 4;

 

Starting restore at 23-SEP-13

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=224 device type=DISK

 

channel ORA_DISK_1: starting datafile backup set restore

channel ORA_DISK_1: specifying datafile(s) to restore from backup set

channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/test0910/users01.dbf

channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_23/o1_mf_nnndf_TAG20130923T100457_940ln9o6_.bkp

channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_23/o1_mf_nnndf_TAG20130923T100457_940ln9o6_.bkp tag=TAG20130923T100457

channel ORA_DISK_1: restored backup piece 1

channel ORA_DISK_1: restore complete, elapsed time: 00:00:01

Finished restore at 23-SEP-13

 

RMAN> recover datafile 4;

 

Starting recover at 23-SEP-13

using channel ORA_DISK_1

 

starting media recovery

media recovery complete, elapsed time: 00:00:01

 

Finished recover at 23-SEP-13

 

RMAN> sql 'alter database datafile 4 online';

 

sql statement: alter database datafile 4 online