How to recover accidentally deleted oracle database

Guide to Recovery of Accidentally Deleted Data in Oracle Database: Confirm Accidental Deletion: Check the database log or backup and try to retrieve the deleted data. Restore data: Restore from backup, if available. Recover from flashback area, if enabled. Use UNDO tablespace recovery if the table has ROW MOVEMENT enabled. Ensure data integrity: Verify data integrity and accuracy, check constraints and run checks. Additional considerations: Ensure access rights, lock tables, back up data, and establish a regular backup schedule to minimize the risk of data loss.

Oracle Database Accidentally Deleted Data Recovery Guide

Step One: Confirm Accidental Deletion

• Check database logs or backups to verify that the data has been deleted.
• Use the SELECT statement to attempt to retrieve deleted data from the table.

Step 2: Restore data

1. Restore from backup (if available)

• Use RMAN (Recovery Manager) to recover deleted data from backup.
• Make sure the backup is up to date and contains data before you accidentally deleted it.

2. Recover from Flash Recovery Area

• Turn on the Flash Recovery Area function to enable automatic backup.
• Use the FLASHBACK DATABASE command to restore to the point before accidental deletion.

3. Use UNDO table space to restore

• UNDO table space stores transaction logs.
• Use the RECOVER TABLE command to recover deleted data, provided that the table has ROW MOVEMENT enabled.

Step 4: Ensure data integrity

• Verify that the recovered data is complete and accurate.
• Check whether primary key and foreign key constraints are still valid.
• Run any necessary checks to ensure data consistency.

Other notes:

• Access permissions: Make sure you have permission to recover data.
• Lock table: Lock the table during recovery to prevent further operations.
• Backup: Back up data immediately after recovery to prevent future data loss.
• Regular backups: Establish a frequent backup schedule to minimize the risk of data loss.

The above is the detailed content of How to recover accidentally deleted oracle database. For more information, please follow other related articles on the PHP Chinese website!