For the sake of storing and processing massive data with high effeciency, a NoSQL database system is needed to be deployed on the virtualized datacenters. Aimed at the problem that it is hard to choose a fitting NoSQL database as there are a variety of NoSQL database systems and most of them are open-source projects, this paper performs mainly three sets of tests on the system performances of two groups of NoSQL deployed on a virtualized platform constructed by Vmware products. Experimental results indicate that these two types of NoSQL databases have the performance differences in different access patterns, data loads and clusters size, which can offer a certain reference for selection of databases in datacenters.%为高效存储和处理海量数据，需要在实施虚拟化的数据中心上部署NoSQL数据库系统。针对NoSQL数据库以开源为主、种类繁多而造成选型困难的问题，采用YCSB测试框架，对在Vmware产品构建的虚拟化平台上部署的两种NoSQL数据库系统性能进行了三组测试。实验结果反映了这两种NoSQL数据库在不同读写场景、不同数据负载以及不同集群大小下的性能差异，对数据中心的数据库选型工作有一定的参考价值。
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