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David managed to accidentally delete the datafiles for database called DSL. He called Heber and Heber tried to help but he managed to delete the control files of the database. Heber called Bill and Bill saved the day. They are using a recovery catalog for this database. What steps did Bill perform to recover the database and in what order?
A. Restored the control file with the RMAN restore controlfile command.
B. Mounted the DSL instance with the alter database mount command.
C. Restored the datafiles for the DSL database with the RMAN restore command.
D. Opened the DSL database with the alter database open resetlogs command.
E. Recovered the datafiles for the DSL database with the RMAN recover command.
F. Started the DSL instance.
G. Connected to the recovery catalog with RMAN.
H. a, b, c, d, e, f, g
I. b, c, d, g, f, e, a
J. g, f, a, b, c, e, d
K. c, a, d, b, f, e, g
L. g, f, a, b, e, c, d
【题目示意】
此题考查有关于RECOVERY DATABASE的相关知识。
【解析】
对于CATALOG方式,所有的备份信息在CATALOG库中都存在,直接restore controlfile就可以了,再还原数据文件,恢复数据文件,以resetlogs的方式打开数据库就可以啦。
【实验】
1)控制文件,数据文件丢失,用恢复目录的方式恢复数据库。连接到恢复目录上
[oracle@ENMOEDU admin]$ rman target / catalog rcowner/oracle@ENMO;
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Feb 5 15:06:43 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database (not started)
connected to recovery catalog database
2)恢复控制文件
RMAN> startup nomount;
Oracle instance started
Total System Global Area 422670336 bytes
Fixed Size 1345380 bytes
Variable Size 318769308 bytes
Database Buffers 96468992 bytes
Redo Buffers 6086656 bytes
RMAN> restore controlfile from autobackup;
Starting restore at 05-FEB-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=134 device type=DISK
recovery area destination: /u01/app/oracle/fast_recovery_area
database name (or database unique name) used for search: ENMOEDU
channel ORA_DISK_1: AUTOBACKUP /u01/app/oracle/fast_recovery_area/ENMOEDU/autobackup/2014_02_05/o1_mf_s_838736684_9h3p9fy9_.bkp found in the recovery area
channel ORA_DISK_1: looking for AUTOBACKUP on day: 20140205
channel ORA_DISK_1: restoring control file from AUTOBACKUP /u01/app/oracle/fast_recovery_area/ENMOEDU/autobackup/2014_02_05/o1_mf_s_838736684_9h3p9fy9_.bkp
channel ORA_DISK_1: control file restore from AUTOBACKUP complete
output file name=/u01/app/oracle/oradata/ENMOEDU/control01.ctl
output file name=/u01/app/oracle/fast_recovery_area/ENMOEDU/control02.ctl
Finished restore at 05-FEB-14
3)恢复数据文件
SYS@ENMOEDU > alter database mount;
[oracle@ENMOEDU admin]$ rman target / catalog rcowner/oracle@ENMO;
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Feb 5 15:13:13 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: ENMOEDU (DBID=95949543, not open)
connected to recovery catalog database
RMAN> restore database;
Starting restore at 05-FEB-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=134 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 00001 to /u01/app/oracle/oradata/ENMOEDU/system01.dbf
channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/ENMOEDU/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/ENMOEDU/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/ENMOEDU/users01.dbf
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/ENMOEDU/he.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/ENMOEDU/backupset/2014_02_05/o1_mf_nnndf_TAG20140205T120405_9h3g1rhx_.bkp
channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/ENMOEDU/backupset/2014_02_05/o1_mf_nnndf_TAG20140205T120405_9h3g1rhx_.bkp tag=TAG20140205T120405
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:01:25
Finished restore at 05-FEB-14
RMAN> recover database;
Starting recover at 05-FEB-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=125 device type=DISK
starting media recovery
archived log for thread 1 with sequence 2 is already on disk as file /u01/app/oracle/fast_recovery_area/ENMOEDU/archivelog/2014_02_05/o1_mf_1_2_9h3oqzhk_.arc
archived log for thread 1 with sequence 1 is already on disk as file /u01/app/oracle/oradata/ENMOEDU/redo01.log
archived log file name=/u01/app/oracle/fast_recovery_area/ENMOEDU/archivelog/2014_02_05/o1_mf_1_2_9h3oqzhk_.arc thread=1 sequence=2
archived log file name=/u01/app/oracle/oradata/ENMOEDU/redo01.log thread=1 sequence=1
media recovery complete, elapsed time: 00:00:06
Finished recover at 05-FEB-14
4)以resetlogs的方式打开数据库
SYS@ENMOEDU > alter database open resetlogs;
Database altered.
【小结】
用catalog的方式恢复数据库,要以catalog的方式连接到数据库上,然后恢复控制文件再使数据文件,以resetlogs的方式打开数据库。因此选择J
【答案】 J
相关参考
http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta2008.htm#RCMRF90314
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