Abstract: This study describes a highly available key-value store Dynamo system. The system is the part of Amazon’s core business which provides “always-on” support services. Dynamo’s main advantage is that it is a fully distributed, no central node of the system and can improve the performance of the system. It provides three parameters (N, R, W) whose value can be set according to users’ needs. It has the full membership mode, where each node knows its peer bearer data. In order to provide this service, the Dynamo system using multiple versions of data and conflict resolutions of the application support solves the data consistency eventually.