Abstract
As a revolutionary application mode in the internet,cloud computing has attracted more and more attentions from both industry and academia.Users can obtain cloud service conveniently through terminals,and access resources of storage,computing and hardware in the Pay-As-You-Go model.The development of cloud computing brings about a series of challenging problems,data management in the cloud is of great importance.In this paper,we propose a framework of cloud data management system.Based on this framework,the key research works of query techniques in cloud data management system are classified and surveyed from several aspects: index management,query processing,query optimization and online aggregation.At last,the suggestions for future research are put forward.
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