An atomic commit protocol can ensure that all participants in a distributed transaction reach consistent states, whether or not system or network failures occur. The atomic commit protocol used in industry and academia is the well-known two-phase commit (2PC) protocol, which has been the subject of considerable work and technical literature for some years.Much of the literature focuses on improving performance in failure cases by providing a non-blocking 2PC that streamlines recovery processing at the expense of extra processing in the normal case. We focus on improving performance in the normal case based on two assumptions: first, that networks and systems are becoming increasingly reliable, and second, that the need to support high-volume transactions requires a streamlined protocol for the normal case.In this paper, various optimlzations are presented and analyzed in terms of reliability, savings in log writes and network traffic, and reduction in resource lock time. The paper's unique contributions include the description of some optimizations not described elsewhere in the literature and a systematic comparison of the optimizations and the environments where they cause the most benefit. Furthermore, it analyzes the feasibility and performance of several optimization combinations, identifying situations where they are effective.

A n atomic commit protocol can ensure that all participants rn a distributed transactron reach consistent states, whether or not system or network farlures occur. One widely used protocol is the two-phase commit (2PC) protocol, whrch has long appeared in the literature.Much of the lrterature focuses on improving performance in failure cases by providing a non blocking 2PC that streamlines recovery processrng at the expense of extra processrng in the normal case. We focus on improvrng performance in the normal case based on two assumptrons: first that networks and systems are becoming increasingly reliable, and second that the need to support high-volume transactions requires a streamlined protocol for the normal case.In this paper, various optimizations are analyzed in terms of reliability. savings in log writes and network traffic, and reductron in resource lock trme.Its unique contributrons Include the description of some optimizations not descrrbed elsewhere and a systematic comparison of the optimrzatrons and the environments where they cause the most benefit.