全系统备份是某一指定时间点(即归档检查点)上整个系统的快照。
A whole-system backup is a snapshot of the entire system at a single point in time (known as the archive checkpoint).
检查点定义数据库在加载流程中成功处理指定数量的记录时的时间点。
A checkpoint defines a point during the loading process at which the database has successfully processed a specified number of records.
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