The backup or shadow server is a continuous checkpoint of the active server, which is implemented through two primary changes to the traditional process of live migration.

备用或影子服务器是活动服务器的一个连续检查点，它通过对传统动态迁移过程进行两处主要改动来实现。

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If an error occurs after a checkpoint, the loading process can be restarted from the rows following the checkpoint.

如果在检查点后出现了任何错误，则可以从检查点后的行重新启动加载流程。

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A checkpoint defines a point during the loading process at which the database has successfully processed a specified number of records.

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。

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Under the new protocols, tests will be conducted at various locations -- including in checkpoint lines, during the screening process and at gates.

CNN: STORY HIGHLIGHTS