If the database provider hosts databases within the same data center that your app is in, ping times are no different than they would be if you ran your own DB

If the database provider hosts databases within the same data center that your app is in, ping times are no different than they would be if you ran your own DB in that data center. Products like RedisGreen host their servers within Amazon and Google's data centers, and are meant for customers hosting their apps within those data centers. In the case of RedisGreen, you choose your hosting provider, region, etc, when provisioning resources. If you sent database queries across the open Internet, ping latency is just one of several problems you'd encounter. (disclosure: I work for RedisGreen)