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NetVault Plug-in for Oracle 11.2 - User Guide

Introducing Quest® NetVault® Backup Plug-in  for Oracle Defining a backup strategy Installing and removing the plug-in Configuring the plug-in Backing up data Using the Oracle® Flashback Database Restoring data
Restoring and recovering data: an overview Performing User Managed restores Using advanced User Managed restore procedures Performing RMAN restores Using RMAN types of recovery in a non-RAC environment Using advanced procedures with RMAN restores
Maintaining the Recovery Catalog Using the RMAN CLI Using the Plug-in with Oracle® RAC Using the Plug-in in a failover cluster environment Using the plug-in with Oracle® Data Guard Troubleshooting

Finalizing and submitting the job

Complete the steps outlined in Finalizing and submitting the job under Performing User Managed restores.

Using RMAN types of recovery in a non-RAC environment

The following topics describe the types of recovery that you can perform in a non-RAC environment:

•
Restoring the Control File from an Autobackup
•
Recovering individual datafiles and tablespaces to the same server
•
Recovering Whole Database to same server
•
Performing disaster recovery with RMAN

For information on the types of RMAN recoveries available in a RAC environment, see Restoring data in a RAC environment.

Restoring the Control File from an Autobackup

Restoring the Control File should only be performed in the following cases:

•
All current copies of the Control File have been lost due to a media failure or accidental user deletion, or have become corrupted and are not usable.
•
Oracle® Customer Support has advised that a Control File restore is required.

As the Autobackup uses a default format, RMAN can restore it even if it does not have a repository available that lists the available backups. RMAN replicates the Control File to all CONTROL_FILES locations automatically.

1
Start RMAN, and connect to the target database:
>rman connect TARGET /
2
Start the target instance without mounting the database:
STARTUP FORCE NOMOUNT;
3
Use SET DBID to set the database identifier for the target database.
RMAN displays the DBID whenever you connect to the target. You can also obtain it by inspecting saved RMAN log files, querying the Catalog, or looking at the filenames of Control File Autobackup. For example, run:
SET DBID <Source_DBID>;
4
Restore the Control File Autobackup:
RUN {
ALLOCATE CHANNEL CH1 TYPE 'SBT_TAPE';
RESTORE CONTROLFILE FROM AUTOBACKUP;
ALTER DATABASE MOUNT;
RESTORE DATABASE;
RECOVER DATABASE;
}
If the default format was modified for the Control File Autobackup, specify the same format during a restore:
RUN {
SET CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE <device type> TO '<string>'
ALLOCATE CHANNEL CH1 TYPE 'SBT_TAPE';
RESTORE CONTROLFILE FROM AUTOBACKUP;
ALTER DATABASE MOUNT;
RESTORE DATABASE;
RECOVER DATABASE;
}
5
Open the database, and reset the online logs:
ALTER DATABASE OPEN RESETLOGS;
Running the ALTER DATABASE OPEN RESETLOGS command from RMAN versus SQL*Plus resets the target database automatically so that you do not have to run a RESET DATABASE. By resetting the database, RMAN considers the new incarnation as the current incarnation of the database. If you run ALTER DATABASE OPEN RESETLOGS from SQL*Plus and do not follow it with a RESET DATABASE at the RMAN prompt, RMAN refuses to access the Recovery Catalog. RMAN refuses because it cannot distinguish between a RESETLOGS operation and an accidental restore of an old Control File.
 
* 
IMPORTANT: After restoring the Control File from an Autobackup, Quest recommends that you perform a Full or Incremental Level 0 backup with the database node selected on the NetVault Backup Selections page.

Recovering individual datafiles and tablespaces to the same server

This type of recovery is performed when the database is open, but some of the datafiles are damaged. This recovery is useful when you want to recover the damaged tablespace, while leaving the database open so that the rest of the database remains available. You can only perform Complete Recovery when restoring and recovering individual datafiles or tablespaces. PIT Recovery is not available for individual datafiles or tablespaces. Enabling PIT Recovery causes the restore job to fail. Following is an overview of the process to recover individual datafiles or tablespaces:

1
On the Create Selection Set page, select the damaged datafiles or tablespaces from the latest available backup of the tablespace, and click Edit Plugin Options.
2
Click the Restore Options tab, and select the Alter Tablespaces Offline Before Restore and the Alter Tablespaces Online After Restore options.
3
On the Perform Recovery tab, select the applicable options:
•
To recover the tablespace to the current time, that is, last committed transaction available in the archive and online redo logs, select the Perform Complete Recovery option.
•
If you do not want to perform any recovery, select the Do Not Perform Recovery option.
 
* 
NOTE: If you select the Perform Database Point in Time Recovery option, the restore job fails.
•
To delete the restored archive logs that Oracle® deems unnecessary, select the Delete Restored Archive Logs No Longer Needed option.
4
Complete the Target Client, Schedule, and Advanced Options tabs, and submit the job.
RMAN automatically chooses the best available Full, Incremental, or Archive Log backups and restore and recover the tablespace.
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