The Economic factors are leading to the rise of
infrastructures provides software and computing facilities as a
service, known as cloud services or cloud computing. Cloud services
can provide efficiencies for application providers, both by limiting
up-front capital expenses, and by reducing the cost of ownership over
time. Such services are made available in a data center, using shared
commodity hardware for computation and storage. There is a varied
set of cloud services available today, including application services
(salesforce.com), storage services (Amazon S3), compute services
(Google App Engine, Amazon EC2) and data services (Amazon
SimpleDB, Microsoft SQL Server Data Services, Google-s Data
store). These services represent a variety of reformations of data
management architectures, and more are on the horizon.
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 Donald Kossmann Tim Kraska Simon Loesing, "An Evaluation of
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 Shan Wang, Zhaohui Peng, Jun Zhang Lu Qin, Sheng Wang , Jeffrey Xu
Yu, Bolin Ding , "NUITS: A Novel User Interface for Efficient
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 Gustavo Alonso Donald Kossmann Timothy Roscoe Nesime
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 Rakesh Agrawal, Anastasia Ailamaki, Philip A. Bernstein, Eric A.
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Research," Proceeding of Claremont Resort in Berkeley Pages 9 - 19 ,