title: flyway - The meaning of the concept of checksums
body: <p>I'm learning Flyway migration tool, and I don't have clear the concept of <strong>checksums</strong>. Could someone explain me what is? how is it calculated, or how can it be changed?</p>
  
  <p>I understand the repair command re-calculate the checksum, I do not understand how it differs.</p>
  
  <p>Thanks!</p>