title: How to change database version of a Google Cloud SQL (Second Gen) instance?
body: <p>I have a large Google Cloud SQL (Second Gen) instance, and I would like to upgrade my database version from MySQL 5.6 to 5.7. But <code>database version</code> option is disabled on the edit instance form.</p>
  
  <p>Why it is disabled, do i have to create a new instance then export and import existing database? My database is too large, and it will be a long downtime.</p>