How to recover accidentally deleted oracle data

Accidentally deleted data in Oracle can be recovered through the following steps: Determine the tables and rows of deleted data. Recover deleted data by running the RECOVER DATA query. Run a query to confirm that the data has been recovered. Note: If the data has been cleared from the undo segment, it cannot be recovered using this method.

Oracle Data Accidentally Deleted Recovery

How to recover accidentally deleted data in Oracle?

Here is a step-by-step guide on how to recover accidentally deleted data in Oracle:

1. Determine the location of accidentally deleted data

• Connect to Oracle database.
• Run the following query to find out the tables and rows with deleted data:

<code>SELECT * FROM V$UNDOSTAT T1 WHERE SCN >= (SELECT SCN_BEGIN FROM V$TRANSACTION WHERE ID=TRxn_Id) AND TRXN_ID=(SELECT MAX(TRXN_ID) FROM V$TRANSACTION);</code>

2. Recover data

• Passed Run the following query to recover deleted data (provided the data is still in the undo segment):

<code>RECOVER DATA IN TABLE <表名> UNDO TABLESPACE <撤消表空间名称>;</code>

3. Confirm recovery

• Run The following query to confirm that the data has been recovered:

<code>SELECT * FROM <表名>;</code>

Additional notes:

• You cannot use this if the data has been cleared from the undo segment Method recovery.
• Before restoring data, it is recommended to back up the database to avoid data loss.
• For large tables, the recovery process may take a lot of time.

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