How to use oracle database flashback function

The flashback function of Oracle database restores the database state at past time points through the following steps: enable the flashback function; determine the recovery time point; perform the flashback operation, specify the time point using the SCN number or timestamp; verify the recovery to the required time point.

Usage of Oracle database flashback function

Oracle database flashback function is a powerful tool. Used to restore the state of the database at a certain point in time in the past. It can be used through the following steps:

1. Enable flashback function

To use flashback function, you must first enable it in the database:

<code>ALTER DATABASE FLASHBACK ON;</code>

2. Determine the recovery time point

Determine the specific time point to restore the database. This can be done by querying the flashback area log (FAL):

<code>SELECT SCN, TIMESTAMP FROM V$FLASHBACK_DATABASE_LOGS;</code>

3. Perform a flashback operation

To flash back to a specific point in time, you can use the following Syntax:

<code>FLASHBACK DATABASE TO SCN <SCN number>;</code>

or

<code>FLASHBACK DATABASE TO TIMESTAMP <timestamp>;</code>

4. Verify recovery

After the flashback operation is completed, verify that the database has been restored to the required time point. important. This can be done by:

• Checking data consistency.
• Run the query to verify the data.
• Audit database logs.

Extra Tip:

• Flashback operations can take a significant amount of time, so this should be considered when planning outage periods.
• The flashback operation will roll back all changes made after the specified time point.
• Before performing a flashback operation, it is recommended to back up the database.
• If you encounter an error while performing a flashback operation, you can cancel using the following syntax:

<code>FLASHBACK DATABASE CANCEL;</code>

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