if you access: hostname/sitecore/admin/cache.aspx you will see the value of all caches.
Please search for prefetch and you will see if the prefetch cache is created.
Database prefetch caches contain items that Sitecore accesses during and immediately after initialization, and items with children that Sitecore often accesses as a group. Sitecore populates database prefetch caches at application initialization, and maintains those caches over the life of the application. Each database prefetch cache stores data from a different database or data source. Not all data providers implement prefetch caches.