在数据库设计方面，详细介绍了子系统的数据库表设计。
In the aspect of database design, the paper introduces database design details of the subsystem.
为了能在数据库系统发生故障之后将数据库恢复到一个一致性的状态，恢复子系统需要进行记日志、做检验点、备份和故障后重装等活动。
Recovery activities like logging, checkpointing, backup and reloading are used to restore the database to a consistent state after a system crash has occurred.
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