Abstract: A distributed computing system includes a group of interconnected memory nodes, where one of the memory nodes is configured as a transaction ID manager. The transaction ID manager is configured to manage concurrency of database transactions by issuing a transaction ID for each database transaction performed in the system. In some embodiments, each memory node in the two-dimensional matrix is configured as a transaction ID manager. In such embodiments, the unique transaction IDs generated by the transaction ID manager at each memory node are transmitted with node-specific information, so that the unique transaction IDs generated at each memory node are distinguished from the unique transaction IDs generated by other memory nodes.