Extract Controlfile from a backupset using RMAN

-
In my previous post, I had talked about extracting controlfiles, datafiles and archivelogs from RMAN backupsets using the package dbms_backup_restore.



In this post, I would like to throw light upon using RMAN as an alternate method that could be employed to extract controlfiles from RMAN backupsets. This method uses the RMAN command "restore controlfile from '<FULL_PATH_TO_CONTROLFILE_BACKUP>'".



The RMAN method can be used in 3 scenarios. So, make sure that at least any one of the backups is indeed available. Else, you are DOOMED!


I. the controlfile autobackup is turned on in RMAN. In this case the file format would be "c<DBID>-<DATE>-<COUNT>".

It is turned on using the command:

configure controlfile autobackup on;
configure controlfile autobackup format for device type disk to '/opt/apps/vision/backup/%F';

II. the controlfile snapshot backup is configured in RMAN.

It is turned on using the command:

configure snapshot controlfile name to '<FULL_PATH_TO_SNAP_CTRL_FILE>';

III. the controlfile is included in the RMAN backupset i.e., using the clause "include current controlfile" in the backup database command.


Scenario I - Restoring controlfile using RMAN and controlfile autobackup.

a. Startup the database in nomount state.



b. Run RMAN commands as below:


$ rman target /


Recovery Manager: Release 9.2.0.6.0 - 64bit Production


Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.


connected to target database: BKP (not mounted)


RMAN> restore controlfile from '/opt/apps/vision/backup/c-261506738-20090722-02';
Starting restore at 23-JUL-09
using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=16 devtype=DISK
channel ORA_DISK_1: restoring controlfile
channel ORA_DISK_1: restore complete
replicating controlfile
input filename=/opt/apps/vision/bkpdata/bkpdatacontrol01.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol02.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol03.ctl

Finished restore at 23-JUL-09

RMAN>


Scenario II - Restoring controlfile using RMAN and controlfile snapshot.



a. Startup the database in nomount state.

b. Run RMAN commands as below:


$ rman target /


Recovery Manager: Release 9.2.0.6.0 - 64bit Production


Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.


connected to target database: BKP (not mounted)


RMAN> restore controlfile from '/opt/apps/vision/backup/snap_BKP_controlfile.ctl';


Starting restore at 23-JUL-09

using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=16 devtype=DISK
channel ORA_DISK_1: copied controlfile copy
replicating controlfile
input filename=/opt/apps/vision/bkpdata/bkpdatacontrol01.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol02.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol03.ctl

Finished restore at 23-JUL-09


RMAN>


Scenario III - Restoring controlfile using RMAN and backupsets (provided backup is taken using the "include current controlfile" clause).


Note: The RMAN backup log would record the backup piece name which includes the controlfile. If you are not sure which backup pice contains the controlfile, then try this on all the backup pieces till the controlfile is restored.


a. Startup the database in nomount state.

b. Run RMAN commands as below:


$ rman target /


Recovery Manager: Release 9.2.0.6.0 - 64bit Production


Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.


connected to target database: BKP (not mounted)


RMAN> restore controlfile from '/opt/apps/vision/backup/BKP_LVL0_20090722_09kkof7i_s9_p1';

Starting restore at 23-JUL-09


using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=16 devtype=DISK
channel ORA_DISK_1: restoring controlfile
channel ORA_DISK_1: restore complete
replicating controlfile
input filename=/opt/apps/vision/bkpdata/bkpdatacontrol01.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol02.ctl
output filename=/opt/apps/vision/bkpdata/bkpdatacontrol03.ctl

Finished restore at 23-JUL-09


RMAN>

Comments

Post a Comment

Popular posts from this blog

java.lang.ExceptionInInitializerError while trying to Access login page

-
Today morning, we (the DBAs) were faced with a strange issue. On Saturday (the 14th of February - (St.) Valentine's day!!), the UNIX boxes hosting our critical test instance went down for scheduled maintenance without any prior information. So, we could not bring down our databases and applications. As soon as the unix box came up, we encountered this issue. Let me briefly describe the environment, the issue, the analysis performed and of course, the solution to this most vexing problem. Environment : Apps Version : 11.5.10.2 with ATG RUP 5 DB Version : 10.2.0.3 Architecture : Two Node instance with database + admin on one tier and web server on another. PS : Another instance (development) exists on the same server with the same configuration, which was working fine. Issue : When trying to access the login page of Oracle Apps, received the below error. Even OAM login page was throwing the same error. Request URI: /OA_HTML/AppsLocalLogin.jsp Exception: java.lang.ExceptionInIniti
Read more

Solution to "End Program - WMS Idle"

-
Image
Though this topic is unrelated any Apps DBA topics, I found it necessary to share the solution so that everyone benifits out of it ! Issue: I used to receive the below error message whenever I tried to shutdown windows XP. A rather vexing problem, no doubt. Cause: This message appears because when windows is trying to shutdown and end all the running processes, the WMS idle process keeps working. Thus an end-program message appears. The two most common reasons for this are: Scout service run by Nero 7 Microsoft Office Communicator 2005 Solution: The fix is simple, disable the Nero 7 scout service if it is enabled. For this, go to Start > All Programs > Nero > Tools > Nero Scout . On this screen , Uncheck Enable the Nero scout. This will fix the issue for most of the users, for the rest of you who are not using Nero are most probably getting this error because of Microsoft Office Communicator 2005. For that you need to either manually exit the communicator 2005 from the s
Read more

WGET shell Script for downloading patches

-
What I have to offer this time is a script using which you can download patches using WGET from Meta.....oops, from My Oracle Support, I should say! This script needs (or accepts) the following parameters: 1. Me...oops...MOS Username 2. MOS (I got it right this time!) password 3. Patch file name 4. ARU Number You can get 3 and 4 in the following way: Using MOS: Query for the particular patch, click on the download link, click on WGET Options on the left side bottom corner and then copy the WGET script to clipboard. That script will have both the patch name and the ARU number. Using HTML (supporthtml.oracle.com): Query for the particular patch, click on the patch, then RIGHT CLICK on the patch zip file link and click on copy shortcut in IE (or copy link location in Mozilla Firefox). This link will have both the patch file name and the ARU number. Using the classic patches window: Query for the particular patch, then RIGHT CLICK on the DOWNLOAD button and click on copy shortcut in IE (or
Read more