如果没有逻辑日志，则系统被还原到某个一致的点上，即归档检查点。

Without logical logs, the system is restored to a consistent point, which is the archive checkpoint.

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多数脚本都是自我归档的（self-documenting），不需要复杂的逻辑。

The scripts are largely self-documenting and do not require sophisticated logic.

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使数据库运行在ARCHIVELOG（归档）方式下，归档日志存放于另一映像的逻辑磁盘上。

Make the database moves in ARCHIVELOG(file) below means, file log deposits the logistic disk at another image to go up.

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