Oracle creates a restore point before sensitive operations

As we all know, in the VMware virtual machine has a snapshot of the function, we can put the state of the system at this time to save, after the side of the non-measured events, it is good to restore the system. Similar functionality is also available in Oracle.
First create a student table:

Insert a piece of data into the student table:

Query data:

The data is displayed correctly, no problem.

I am now going to delete this data 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