1. Samatha, N., Vijay, C.K., Raja, S.R.P.: Query optimization issues for data retrieval in cloud computing. Int. J. Comput. Eng. Res. 2(1361–1364), 22 (2012)
2. Lang, W., Nehme, R. V. and Rae, I.: Database optimization for the cloud: where costs, partial results, and consumer choice meet. In: Biennial Conference on Innovative Data Systems Research (CIDR’15), California, USA (2015)
3. Amazon Web Services.:
http://aws.amazon.com/
4. Google Apps.:
www.google.com/Apps/Work
5. Microsoft Azure.:
http://azure.microsoft.com/en-us/