What is needed to develop a database in the cloud?

Question

What is needed (in general terms) to create a service like MongoHQ or SimpleDB?

thank

Answer 1

Cloud computing - primer
http://www.ipjforum.org/?p=199

See also:

Is a relational database doomed?
http://www.readwriteweb.com/enterprise/2009/02/is-the-relational-database-doomed.php