Oracle creates a restore point before sensitive operations

As we all know, there is a snapshot in the VMware virtual machine function, we can put the system at this time to save the state, the side of a contingency event, or restore the system, Oracle also has similar features.
First create a student table:

Insert a piece of data into the student table:

Query data:

The data is displayed correctly, no problem.
I'm going to delete this data now and create a restore point before deleting it:

After the deletion, then to query, the data is gone:

Then I revert to the point where I just restored, and then I queried the data:

Oracle creates a restore point before sensitive operations