Concurrency control of transactions is the emphasis of such study.
而事务的并发控制，则是研究的重点。
However, it may be necessary at times to have further control of transactions.
然而，有时对事务进行进一步的控制也是很必要的。
They propagate transactions and control the quality and timing of message delivery.
它们传播事务、管理质量和消息传递定时。
They propagate transactions and control the quality and timing of message delivery.
它们传播事务、管理质量和消息传递定时。
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