I need to know two things, and would appreciate help with them...

Question 1: I want to delete all the values in my column 'testValue' and in my column ID.

Question 2: I will be storing large amounts of strings and integers (a lot), and I would like to know how to assess how much space in bytes (from bytes I can turn that into kilobytes, and megabytes), does anyone know that?

Thanks alot