I can made a change into field tam size directly in database?

[rslemer]

http://corebos.com/documentation/doku.php?id=en:devel:field_structure&s[]=field&s[]=type

I look at this tutorial

I created a field, numeric, with 2 digits, and zero decimals, but I need change it to 3 digits

is possible change directly in database ? without lose any value already input ?

Only I need is change a last number? ( see a attached image )