How to use Oracle flashback recovery to restore data?
The Flashback Data Recovery feature of Oracle can assist you in recovering deleted or mistakenly modified data. Here are the steps for using Oracle’s Flashback Data Recovery feature:
- Ensure that you have the appropriate permissions. Typically, only users with the SYSDBA or SYSBACKUP roles can perform flashback operations.
- Log in to the target database using SQL*Plus or other Oracle database management tools.
- Check if the flashback feature has been enabled by running the following command.
- Show the status of flashback mode in the database.
- If the result is “YES”, then the flashback function is enabled.
- Use the following command to restore the database to a specific point in time (flashback query):
- Restore table_name to a previous state based on the timestamp timestamp_value.
- In this case, table_name is the name of the table to be restored, and timestamp_value is the point in time to restore to.
- To restore the entire database to a specific point in time, you can use the following command:
- Restore the database to a previous timestamp.
- timestamp_value is the point in time to which the recovery is being made.
- If you only want to restore deleted rows and not the entire table, you can use the following command:
- Undo the dropping of a table by using a flashback.
- This will restore the recently deleted table and its contents.
- You can also use a flashback query to find previous changes made to a table.
- Retrieve all data from the table at a specific time stamp.
- table_name is the name of the table to be queried, while timestamp_value is the time point of the query.
Please note that using the flashback feature requires having enough flashback area space, so make sure the flashback area has enough space before performing a flashback operation. Also, the flashback feature can only recover data that is in the flashback area, so be sure to enable the flashback feature before performing any modification operations.
