How to restore after deletion in oracle

To recover deleted Oracle data, you can use the following steps: 1. Confirm that the data has been deleted; 2. Check the backup; 3. Use the flashback tool; 4. Recover from the recycle bin table; 5. Use Undo tablespace. Always back up your database, enable flashback functionality and Undo tablespaces, and implement a data recovery plan.

How to recover deleted Oracle data

When the data in the Oracle database is accidentally deleted, you can use the following Steps to recover deleted data:

1. Confirm that the data has been deleted

• Check the redo log to confirm that the data has been deleted.
• Query the recycle bin table (for example,recyclebin) to see if deleted data is stored there.

2. Check the backup

• If there is a latest database backup, the deleted data can be restored from the backup.
• Please note that restoring data from backup may result in data loss, depending on the point in time of the backup.

3. Use the flashback tool

• Oracle provides the flashback tool to recover deleted data.
• Flashback allows you to restore a database to a specific point in time, provided this feature is enabled.

• Use the following query to restore data using flashback:

  FLASHBACK TABLE <表名> TO SCN ;

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The SCN number is the system change number (SCN) in the database when the transaction was committed.

4. Recover from the recycle bin table

• #If the deleted data is stored in the recycle bin table, you can use the following Query to restore it:

  RESTORE <表名>.<列名> FROM RECYCLEBIN;

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5. Use Undo table space

• If Oracle's Undo table space is enabled , you can use the following query to recover deleted data:

  SELECT * FROM <表名> AS OF TIMESTAMP <时间戳>;

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The timestamp is the point in time when the data was deleted.

Tip:

• Always back up your database before performing any recovery operations.
• Regularly enable Oracle’s flashback function and Undo table space.
• Implement a data recovery plan to prevent data loss.

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