This overhead is constant and not otherwise dependent on the work done by the transaction.
这个开销是恒定的，并不取决于事务所做的工作。
However, as Copeland clearly identifies, transaction testing, a category under which acceptance testing falls, is distinctly dependent upon data.
然而，当Copeland清楚地被识别时，处理测试，一个验收测试之下的类别失败了，很显然它是依靠数据的。
Based on message exchanges between transactions, different transaction can be checkpoint dependent and recovery dependent upon each other.
形式地给出了合作事务定义及事务间由于消息交换而形成的事务间的检验点依赖和恢复依赖。
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