The overhead of such systems comes from two aspects: comparing and saving operations at each checkpoint, and the rollbacks caused by faults.
上述系统的开销主要来自两方面：其一是每个检查点的比较和保存开销，其二是因故障而引起的卷回。
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A restart area is similar to a checkpoint in other log processing systems.
重新开始区域类似于其他日志处理系统内的检查点。
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