If you need to cache large datasets memcached / dalli_store might not be enough, in that case you could combine different cache strategies in Rails.

combining_different_cache_stategies_rails.rb

# Using Dalli Store gem for default caching, just use Rails.cache directly
# https://github.com/petergoldstein/dalli
Rails.cache.fetch('some-key', expires_in: 1.hour) do
  #foo baa and a lot of work
end

# Now use Rails FileStore cache as alternative strategy by using ActiveSupport::Cache::FileStore directly
cache = ActiveSupport::Cache::FileStore.new File.join(Rails.root, 'tmp', 'cache', 'some-name')
cache.fetch('some-key', expires_in: 1.hour) do
  # some hard work returning a huge dataset to large for memcached
end