International Journal of Engineering and Innovative Technology (IJEIT)
Service oriented applications define the Quality of Services (QoSs) in terms of a Service Level Agreement (SLA) which guaranties the non-functional attributes for the users. However, web services usually have unpredictable load conditions and fluctuating demands which make it difficult to maintain the predefined SLA. For example, extreme access of service-based application, such as e-commerce or news web services connected to a database. It is challenging to provide the expected QoS attributes, such as the response time. Cloud computing has gained a huge interest in academia and major IT organizations.