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This paper presents the impact analysis of the hypervisor layer over database applications. The conclusions were reached by performing experiments with hybrid environments, composed by bare-metal servers and two types of hypervisors. The main objectives were to compare the behaviour of database applications and to determine the maximum service capacity of a virtualized database server on different environments. With the results, it was possible to assess the scalability of a database environment, according to the type of hypervisor and the number of simultaneous connections, and decide how and when to expand or reduce the virtualized infrastructure.

Cloud environment has emerged as a tool that can provide on demand access to resources that meet high computing power and storage capacity for scientific applications. However some difficulties remain, particularly regarding performance. The cause is not related only to the virtualization layer, but also to the type of application handled by this layer. In this work we present the importance of this relationship and how a hybrid virtual environment can contribute to reduce the loss in performance.