The once-per-batchcost to start up a new transaction, dispatch the MDB, and perform transactional cleanup is b.
启动新事务、分派mdb和执行事务清除的每次一批的开销为b。
2
The average deep fryer uses almost an entire quart of oil, and if it is only used once, the cost of a batch of fries can amount to just as much as an entire restaurant meal.