How do I recover a lost datafile in Oracle?

How do I recover a lost datafile in Oracle?

How to recover missing datafiles?

  1. Find the missing datafiles:
  2. Take tablespace or datafiles offline:
  3. Rename missing datafiles with original files:
  4. Shutdown and mount the database:
  5. Perform media recovery:
  6. Open the database:
  7. check the status of datafiles:
  8. Bring the datafiles online:

What is media recovery in Oracle?

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?

Recovery of system01. dbf datafile

  1. Shutdown the database.
  2. Restore the system01. dbf from the latest backup to the datafile location.
  3. Mount the database.
  4. SQL>Recover datafile 1;
  5. SQL>Alter database open.

How will you recover the database from a loss of a data file?

The Solution

  1. Connect to the database using sqlplus and shutdown the database. SQLPLUS> shutdown immediate #(If this hangs, issue shutdown abort)
  2. Mount the database: SQL> startup mount. Check for the datafile which needs recovery:
  3. Note the file number that was reported in the output above and run the below query:

How do I know which datafile needs recovery?

Check for Data Files That Need Recovery

  1. Go to the cmd prompt.
  2. Start sqlplus.
  3. Connect sys/password as sysdba.
  4. Run the following query:
  5. Note all file# numbers that require recovery.
  6. Connect sys/password as sysdba in sqlplus and type the following SQL command for each datafile:

How do I restore my backup files?

Restore files with File History

  1. Connect the external storage device that contains your backup files.
  2. In the search box on the taskbar, type Control Panel, then select it from the list of results.
  3. In the search box in Control Panel, type File History.
  4. Follow the instructions to restore your files.

What is difference between restore and recovery in Oracle?

What is the difference between restoring and recovering?[edit] Restoring involves copying backup files from secondary storage (backup media) to disk. This can be done to replace damaged files or to copy/move a database to a new location. Recovery is the process of applying redo logs to the database to roll it forward.

What are the types of recovery?

There are three basic types of recovery: instance recovery, crash recovery, and media recovery.

How do I change my data file from recovery to online?

Bring All Data Files Online Select file# from v$datafile where status = ‘OFFLINE’; Note all file# numbers that are returned. Then, while in sqlplus connected to the database as sys/password as sysdba.

What does recover database do?

RECOVER DATABASE Command RECOVER DATABASE performs media recovery on all online datafiles that require redo to be applied. If all instances were cleanly shutdown, and no backups were restored, RECOVER DATABASE indicates a no recovery required error.

How do I backup and restore an Oracle database?

Step 1: Restore ControlFile from Backup

  1. Set the DBID. You can get the dbid from the name of the control file.
  2. Startup the database in nomount option.
  3. Restore the controlfile form the backup. In this example, the RMAN backup is located under /backup/rman directory.
  4. After restoring the control file, mount the database.

How can I restart an Oracle Database?

Access the Database Home page for the desired database instance.

  • Click Startup.
  • Enter credentials as follows: Enter the host computer credentials for the user who installed the database Oracle home.
  • How to rename or move a datafile in Oracle?

    If the database is up,shut it down.

  • Copy the datafile to the new name/location at the operating system level.
  • Mount the database.
  • Rename the file inside Oracle.
  • Open the database.
  • Query v$dbfile to confirm that the changes made were correct.
  • Remove the datafile (s) from the old location at the operating system level.
  • How to start Oracle Database automatically?

    Steps to configure auto startup/shutdown. Edit the/etc/oratab file,and place a Y at the end of the entry for the databases you want to automatically restart when the system

  • Understanding the script. Rest of the script is pretty easy to understand.
  • Make script executable and Enable to run on boot.
  • Testing the script
  • Final Thoughts.
  • How do I recover lost files on my computer?

    To restore files from PC, open Backup and Restore by hitting on Start button. Select Control Panel and click on System and Maintenance, again click on Backup and Restore. Press on Restore my files and follow the steps in wizard. If lost files are not present in it then opt for reliable file recovery software.

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