ACID Support and Fault-Tolerant Database Systems on Cloud:A Review

Cloud computing represents a different way to architect and remotely manage computing resources. One has only to establish an account with Microsoft or Amazon or Google to begin building and deploying application systems into a cloud. These systems can be, but certainly are not restricted to being simplistic. Some applications requires http services, some requires relational database or might require web service infrastructure and message queues. With clouds, IT-related applications can be provided as a service, which can be accessed through internet. There are platforms on cloud which provide scalability and high availability properties for web applications but there are problems related to data consistency at the same time, and in case of server failures, it becomes major problem in applications related to payment services. Data needs to be properly managed in cloud environment and to achieve proper transaction processing and consistency, RDBMS techniques such as ACID transactions should be used. Web services in Azure ensure application availability by replicating stored data at least three times and offer optional geolocation of replicas in separate Microsoft data centres to provide disaster recovery services.Azure storage services provide scalable persistent storage of structured tables, blobs and queues.