Energy-Saving Multi-version Timestamp Ordering Algorithm for Virtual Machine Environments.

In order to realize distributed applications, conflicting transactions are required to be serializable. The Multi-Version Concurrency Control (MVCC) is widespread to not only improve the concurrency of transactions but also serialize transactions. The Multi-Version Timestamp Ordering (MVTO) algorithm is one of algorithms to realize the MVCC. However, the MVTO algorithm does not consider the electric energy consumption of servers to perform transactions. In this paper, the Energy-Saving Multi-Version Timestamp Ordering with Virtual Machines (ESMVTO-VM) algorithm is newly proposed to not only improve the concurrency of transactions but also decrease the electric energy consumption of a cluster of servers which are equipped with virtual machines without performing meaningless write methods. In evaluation, we show the ESMVTO-VM algorithm can decrease the electric energy consumption of a cluster of servers than the MVTO algorithm.