title: Are there any limits on length of string in mysql?
body: <p>I am using MySQL data base with Rails. I have created a field of type <code>string</code>. Are there any limits to its length? What about type <code>text</code>?<br>
  Also as <code>text</code> is variable sized, I believe there would be extra costs associated with using text objects. How important can they get, if at all?</p>