OCP-1Z0-052-V8.02-91题

91. View the Exhibit to examine the error that occurred during the database startup.

You opened an RMAN session for the database. To repair the failure, you executed the following
command as the first RMAN command:
RMAN>REPAIR FAILURE;
Which statement describes the consequence of this command?
A.The command performs the recovery and closes the failure.
B.The command only displays the advice and the RMAN script required for recovery.
C.The command executes the RMAN script to repair the failure and remove the entry from the Automatic
Diagnostic Repository (ADR).
D.The command produces an error because the ADVISE FAILURE command was not executed before
the REPAIR FAILURE command.

 

答案解析：

1、首先来看下各个文件的位置。

 

sys@TEST0910> select FILE_ID,FILE_NAME,TABLESPACE_NAME from dba_data_files;

 

   FILE_ID FILE_NAME                                          TABLESPACE_NAME

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

         4 /u01/app/oracle/oradata/test0910/users01.dbf       USERS

         3 /u01/app/oracle/oradata/test0910/undotbs01.dbf     UNDOTBS1

         2 /u01/app/oracle/oradata/test0910/sysaux01.dbf      SYSAUX

         1 /u01/app/oracle/oradata/test0910/system01.dbf      SYSTEM

         5 /u01/app/oracle/oradata/test0910/example01.dbf     EXAMPLE

 

2、先用rman备份users表空间，用作恢复。

RMAN> backup tablespace users;

 

Starting backup at 13-SEP-13

using target database control file instead of recovery catalog

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=67 device type=DISK

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 13-SEP-13

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

piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_13/o1_mf_nnndf_TAG20130913T111426_936byprm_.bkp tag=TAG20130913T111426 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:15

Finished backup at 13-SEP-13

 

3、操作系统删除users.dbf文件

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

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

ls: /u01/app/oracle/oradata/test0910/users01.dbf: No such file or directory

 

 

4、shutdown abort模拟数据库宕机并startup，发现错误与题目一样

sys@TEST0910> shutdown abort;

ORACLE instance shut down.

sys@TEST0910> startup

ORACLE instance started.

 

Total System Global Area 2505338880 bytes

Fixed Size                  2230952 bytes

Variable Size             553649496 bytes

Database Buffers         1929379840 bytes

Redo Buffers               20078592 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 4 - see DBWR trace file

ORA-01110: data file 4: '/u01/app/oracle/oradata/test0910/users01.dbf'

 

 

5、进入rman，修复失败。

RMAN> repair failure ;

 

using target database control file instead of recovery catalog

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of repair command at 09/13/2013 11:20:04

RMAN-06954: REPAIR command must be preceded by ADVISE command in same session

 

在试图没有进行advise failure命令时使用repair failure，则报错。

主要原因为：在repair failure之前，要先运行advise failure，让rman给出修复的建议，并给出修复的脚本，之后再运行repair failure

 

6、按照提示，进行advise命令。

RMAN> advise failure;

 

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of advise command at 09/13/2013 11:20:59

RMAN-07211: failure option not specified

 

为什么也报错呢？原因为在advise failure之前，要先运行list failure，列出所要修复的错误，所以先list failure。

 

7、运行LIST-->ADVISE-->REPAIR 命令

 

RMAN> list failure;

 

List of Database Failures

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

 

Failure ID Priority Status    Time Detected Summary

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

122        HIGH     OPEN      13-SEP-13     One or more non-system datafiles are missing

 

 

 

RMAN> advise failure;

 

List of Database Failures

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

 

Failure ID Priority Status    Time Detected Summary

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

122        HIGH     OPEN      13-SEP-13     One or more non-system datafiles are missing

 

analyzing automatic repair options; this may take some time

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=189 device type=DISK

analyzing automatic repair options complete

 

Mandatory Manual Actions

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

no manual actions available

 

Optional Manual Actions

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

1. If file /u01/app/oracle/oradata/test0910/users01.dbf was unintentionally renamed or moved, restore it

 

Automated Repair Options

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

Option Repair Description

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

1      Restore and recover datafile 4 

  Strategy: The repair includes complete media recovery with no data loss

  Repair script: /u01/app/oracle/diag/rdbms/test0910/test0910/hm/reco_3910127882.hm

 

advise failure命令对记录在自动诊断信息库中的所有故障给出建议。默认时，此命令只列出具有critical或high优先级的那些故障。除了产生所有输入故障的摘要外，此命令还对每个故障提供一个建议修复选项。通常，advise  failure命令同时给出自动和手动修复选项。在advisefailure命令输出结束时，RMAN生成一个脚本，列出建议的修复选项的细节。如果你想自己进行修复，可以直接使用这个脚本，或者对它进行修改。

 

RMAN> repair failure;

 

Strategy: The repair includes complete media recovery with no data loss

Repair script: /u01/app/oracle/diag/rdbms/test0910/test0910/hm/reco_3910127882.hm

 

contents of repair script:

   # restore and recover datafile

   restore datafile 4;

   recover datafile 4;

   sql 'alter database datafile 4 online';

 

Do you really want to execute the above repair (enter YES or NO)? Y

executing repair script

 

Starting restore at 13-SEP-13

using channel ORA_DISK_1

 

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_13/o1_mf_nnndf_TAG20130913T111426_936byprm_.bkp

channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/TEST0910/backupset/2013_09_13/o1_mf_nnndf_TAG20130913T111426_936byprm_.bkp tag=TAG20130913T111426

channel ORA_DISK_1: restored backup piece 1

channel ORA_DISK_1: restore complete, elapsed time: 00:00:15

Finished restore at 13-SEP-13

 

Starting recover at 13-SEP-13

using channel ORA_DISK_1

 

starting media recovery

media recovery complete, elapsed time: 00:00:09

 

Finished recover at 13-SEP-13

 

sql statement: alter database datafile 4 online

repair failure complete

 

Do you want to open the database (enter YES or NO)? YES

database opened

 

 

利用advise failure 命令提供的建议，repaire failure根据建议恢复错误。