Multiple tree quorum algorithm for replica control in distributed database systems

A novel replica control algorithm, called the multiple tree quorum (MTQ) algorithm, is proposed to manage replicated data in distributed database systems. This algorithm provides a high availability for read and write operations by imposing a logical structure of multiple trees on data copies. With the MTQ algorithm, a read operation is limited to a couple of data copies, and a write operation is allowed as long as the majority of the roots of the trees and the majority of the children of each node selected are available. Compared to other algorithms, the MTQ requires lower message cost for an operation while providing higher availability.<>