Assume that in your local datacenter you has a database of a web application consists of 10 million rows, with attributes like id, name, surname, age, city information. You observe that your web application is slowing down due to single beefy server being used. If you decide to use cloud computing services, what kind of sharding techniques are available to be used? Explain in detail. Which of those will be best for a proper load balancing assuming 40 servers are available to be used?