A performance management method, system, and non-transitory computer readable medium for a service for database as a service (DBaaS) in a cloud computing environment, include a receiving and comparing circuit configured to receive a service request from a user and compare the received service request to at least one prior received service request, a similarity calculating circuit configured to calculate a similarity between the service request and the at least one prior received service request based on a requirement that the service request places on the DBaaS, and a data verifying circuit configured to verify whether information within the database of the DBaaS has changed since an identical prior received service request based on the receiving and comparing circuit identifying the identical prior received service request.