The web application was, one at a time, connected to the MySQL, Cassandra and HBase databases and the load testing was done using nGrinder (nGrinder is a web application that is used as a load testing tool. It calculates the load in terms of Transactions per Second (TPS)). nGrinder formulated the JSON text in such a manner that in every transaction, a new row was inserted in both tables in MySQL and Cassandra and in both column families in case of HBase. Thus, in each transaction we perform 2 write operations. The TPS graph as obtained by nGrinder after running the load test for 10 minutes for each database is depicted in Fig. 4, Fig. 5 and Fig. 6. It is worth mentioning that nearly same results were obtained after running the load test on each database for 30 minutes