What is Oracle media recovery?
Media recovery is most often used to recover from media failure, such as the loss of a file or disk, or a user error, such as the deletion of the contents of a table. Media recovery can be a complete recovery or a point-in-time recovery.
How do I restore a DBF file in Oracle?
ORACLE instance shut down. SQL> SQL> startup mount ORACLE instance started….
- To restore data files to their current location, the database must be started, mounted, or open with the tablespaces or data files to be restored offline.
- If you use RMAN in a Data Guard environment, then connect RMAN to a recovery catalog.
What do you mean by media recovery?
In case the SCN on datafile and controlfile database throws as exception. Media recovery is a two step process of restoring the backups / archivelogs and applying the same to corrupted datafiles in sequential manner. Media recovery can be done using SQLPlus or with RMAN.
How do I open an Oracle DBF file?
Shows the Open dialog box. Select a DBF file and click Open. If you select multiple files, all of them will be opened….The filter in the Open dialog box consists of the following file extensions:
- DBF Files (*. DBF) – Data Base File.
- Memo Files (*. FPT, *.
- All Files (*. *) – force DBF Commander to open a non-DBF file.
How do I restore a tablespace in Oracle?
Restore a Single Tablespace Using RMAN
- Take the tablespace offline: alter tablespace offline;
- Issue the restore command from an RMAN prompt.
- After the restore is completed, a “Recover” needs to be issued.
- Finally, the tablespace can be brought back online.
What are the types of data recovery?
There are two types of recoveries, logical data recovery and physical data recovery.
What is the purpose of data recovery?
Data recovery is the process of restoring data that has been lost, accidentally deleted, corrupted or made inaccessible. In enterprise IT, data recovery typically refers to the restoration of data to a desktop, laptop, server or external storage system from a backup.
How do I recover data from Oracle Database?
For maximum performance, use parallel recovery to recover the datafiles. See”Performing Media Recovery in Parallel”. Oracle begins the roll forward phase of media recovery by applying the necessary redo log files (archived and online) to reconstruct the restored datafiles.
How does Oracle Media recovery work?
Oracle begins the roll forward phase of media recovery by applying the necessary redo log files (archived and online) to reconstruct the restored datafiles. Unless the applying of files is automated using SET AUTORECOVERY ON, Oracle prompts for each required redo log file.
Can I recover a datafile without opening the database?
A datafile is taken offline (either by you or automatically by Oracle) without the OFFLINE NORMAL option. Unless the database is not open by any instance, datafile media recovery can only operate on offline datafiles. You can initiate datafile media recovery before opening a database even when crash recovery would have sufficed.
Why doesn’t Oracle display the log file for media recovery?
When you perform media recovery using SQL statements, Oracle does not display a prompt for log files after media recovery is started. Instead, you must provide the correct log file using an ALTER DATABASE RECOVER LOGFILE statement.