If we have both, we could run with UR during read-only windows when all of the rows are committed and run with CS when maintenance is being performed and we need to be protected from "dirty" data. 如果我们两个都有,当对所有行都要操作时,我们可以在只读窗口中运行UR,而在需要进行维护并且避免受到“脏”数据影响时,运行CS。