Deleted data in the Oracle database can be recovered through the following methods: Transaction rollback: Deleted data within the transaction can be restored. Flashback queries: access deleted data at a specific point in time. Flashback tablespace: Create a copy of the database, containing deleted data. Log files: Recover deleted data with professional tools. Third-party tools: Provide more advanced recovery options and automated processes.
How to recover deleted data in Oracle database?
Recovery method:
1. Transaction rollback:
- If the DELETE operation is If executed within a transaction, rolling back the transaction can restore deleted data.
- Use the ROLLBACK command to roll back an ongoing transaction.
2. Use Flashback Queries:
- Flashback queries can access deleted data in the table.
- Use the AS OF TIMESTAMP clause to specify the time point to be accessed, and then use the SELECT command to retrieve the data.
- This time point must be before the DELETE operation.
3. Use Flashback Table Space:
- Flashback Table Space creates a copy of the database state, including deleted data.
- Use the ALTER TABLESPACE command to put the table space into flashback mode.
- Then use the SELECT command to retrieve the deleted data from the flashback tablespace.
4. Use log files:
- Oracle database records all data modifications, including DELETE operations.
- Recovering data in log files requires professional tools and techniques.
5. Use third-party tools:
- There are third-party tools that can help recover deleted data, such as Oracle Recovery Manager (RMAN) .
- These tools provide more advanced recovery options and automated processes.
Note:
- The availability of the above recovery methods depends on the database configuration and data protection strategy.
- Timely backup of the database is crucial for data recovery.
- Consult your database administrator or Oracle expert before attempting to recover deleted data.
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