In this paper, based on an empirical simulation study, we report on the performance implications of five atomic commit protocols on transaction throughput in future, wide-area gigabit-networked database systems. In our study, in addition to the three well known two-phase commit (2PC) variants, we considered two single-phase commit protocols, namely, the implicit yes-vote (IYV) and coordinator log. Salient results of our study show that IYV is, in general, better than all the other evaluated protocols during normal processing. Performance enhancements due to a read-only optimization are more pronounced with short transactions. The choice of a 2PC variant has very little impact on performance in the case of long transactions as opposed to short ones, with presumed commit being better than presumed abort in most cases.
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